ANNUALREPORT2 O 1 8Vol.1: HighlightEditorial Board (April 2019 – March 2020)

Hideaki HOTCHI (Accelerator Division)

Takayuki YAMAZAKI (Materials and Life Science Division)

Masaharu IEIRI (Particle and Nuclear Physics Division)

Kazuo GORAI (Information System Section)

Shigeru SAITO (Transmutation Division)

Fumihiro SAITO (Safety Division)

Shinji NAMIKI (Users Office Team)

Naomi EBISAWA (Public Relations Section)

Cover photographs
Photograph ① : KOTO circuits, output connectors
Image credit: Masahiko UOTA

Photograph ② : Extremely cold world
Image credit: Koji NUNOMURA

Photograph ③ : Neutrino Experimental Facility
Image credit: Hiroshi ITO

J-PARC Annual Report 2018
Contents
Preface……………………………………………………………………………………………………………… 1
Accelerators………………………………………………………………………………………………………… 3
Overview of the Accelerator…………………………………………………………………………………… 3
Linac ………………………………………………………………………………………………………… 6
RCS…………………………………………………………………………………………………………… 9
MR………………………………………………………………………………………………………… 12
Materials and Life Science Experimental Facility………………………………………………………………… 15
Overview…………………………………………………………………………………………………… 15
Progress of the Neutron Source Section…………………………………………………………………… 16
Neutron Science Section…………………………………………………………………………………… 17
Neutron Device…………………………………………………………………………………………… 18
Muon Section……………………………………………………………………………………………… 19
Technology Development Section………………………………………………………………………… 20
Particle and Nuclear Physics……………………………………………………………………………………… 23
Neutrino Experiment……………………………………………………………………………………… 23
Hadron Experimental Facility……………………………………………………………………………… 24
Strangeness / Hadron Physics Experiments ……………………………………………………………… 25
Kaon Decay Experiment…………………………………………………………………………………… 25
Muon Experiments………………………………………………………………………………………… 26
Highlight: First Major Result from KOTO: Breaking the World’s Best Sensitivity for a CP-Violating
Rare Kaon Decay by an Order of Magnitude……………………………………………………………… 26
Cryogenics Section ……………………………………………………………………………………………… 29
Overview…………………………………………………………………………………………………… 29
Cryogen Supply and Technical Support…………………………………………………………………… 30
Superconducting Magnet System for T2K………………………………………………………………… 30
Superconducting Magnet Systems at the MLF…………………………………………………………… 31
Superconducting Magnet Systems at the HEF …………………………………………………………… 31
R&D for the Future Projects at J-PARC……………………………………………………………………… 32
HTS Maglev Coaster for Demonstration…………………………………………………………………… 32
Information System……………………………………………………………………………………………… 33
Overview…………………………………………………………………………………………………… 33
Status of Networking……………………………………………………………………………………… 33
Internet Connection Services for Visitors and Public Users of J-PARC……………………………………… 35
Status of Computing ……………………………………………………………………………………… 36

Transmutation Studies…………………………………………………………………………………………… 39
Overview…………………………………………………………………………………………………… 39
Research and development ……………………………………………………………………………… 41
Safety ……………………………………………………………………………………………………………… 45
Safety……………………………………………………………………………………………………… 46
User Service ……………………………………………………………………………………………………… 49
Users Office (UO)…………………………………………………………………………………………… 50
User Statistics……………………………………………………………………………………………… 52
MLF Proposals Summary - FY2018………………………………………………………………………… 53
J-PARC PAC Approval Summary for the 2018 Rounds……………………………………………………… 55
Organization and Committees…………………………………………………………………………………… 57
Organization Structure……………………………………………………………………………………… 58
Members of the Committees Organized for J-PARC………………………………………………………… 59
Main Parameters ………………………………………………………………………………………………… 65
Events ……………………………………………………………………………………………………………… 67
Events……………………………………………………………………………………………………… 67
Publications……………………………………………………………………………………………………… 73
Publications in Periodical Journals………………………………………………………………………… 74
Conference Reports and Books…………………………………………………………………………… 81
KEK Reports………………………………………………………………………………………………… 89
JAEA Reports……………………………………………………………………………………………… 89
Others……………………………………………………………………………………………………… 90

J-PARC Annual Report 2018

Preface1

PrefaceThis volume describes the progress made at J-PARC in fiscal year 2018, from April
2018 through March 2019.
We have been steadily improving the stability and beam power of the facilities
towards the design power of 1 MW at the Material and Life Sciences Experimental Facility(MLF) and 0.75 MW for Fast Extraction (FX) and 0.1 MW for Slow Extraction (SX) at theMain Ring (MR).
1
At MLF, we were able to perform a continuous operation at 1 MW for more than anhour. It provided a confidence to operate the MLF with the design power in a foreseeable
future.
At the MR, we were able to provide a highest possible beam power operation within
the current limitation of hardware, both in FX and SX mode. However, to our deepest
regret, the SX beam time was cut short due to a malfunction of one of the bending
magnets in the beam-transport line, 3-50BT, which transports the beam from the Rapid
Cycle Synchrotron (RCS) to the MR. It clearly represented one of our weak points in themaintenance scenario, which will be improved soon.
1

The operation at 1 MW means, the beam power at the RSC is 1 MW, and the extracted beam power to the MLF
was 932 kW, due to beam bunches planned for an MR injection.

Preface

J-PARC Annual Report 20182

The continuous efforts to maintain the facilities with high availability and highbeam power have resulted in many impactful scientific results produced with the users
from both domestic and oversea research institutions and industries. Those results aredescribed in this volume. Some of them were also shared with the community andsociety through press releases at a rate of more than one per month. We will continue
this high level physics production mode by deepening and widening the collaborations
with the users from all over the world, across the fields.
As was done in the previous years, we have been enhancing the collaboration withdomestic universities, oversea institutions, and industrial sectors. We hope that deeper
and wider collaboration will provide more impactful outcomes. It also helps creation of
the future not only by expanding the frontier of academic knowledge and the variety
of materials, but also by fostering the next generation of researchers with an extensive
experience in cutting-edge facility operation, who can, in turn, produce the next
generation of research facility for the future.
“High power beams for the next stage of our life!”

Naohito SAITO
On behalf of the J-PARC staff members,
Director of J-PARC Center

RCS ring

L3BT injection beam line

Accelerators

Overview of the Accelerator
The J-PARC accelerator complex consists of a
400 MeV linac, a 3 GeV Rapid Cycling Synchrotron (RCS)
and a Main Ring Synchrotron (MR, 30 GeV). A proton
beam from the RCS is injected to the Materials and Life
Science Experimental Facility (MLF) for neutron andmuon experiments. The MR has two beam extraction

modes: fast extraction (FX) for the Neutrino experimental facility (NU) and slow extraction (SX) for the Hadronexperimental facility (HD).
The operation in FY2018 is illustrated in Fig. 1. The
topics related to the beam operation are as follows:

Fig. 1. Accelerator operation in FY2018 (includes a short period at the end of FY2017).

Accelerators

J-PARC Annual Report 2018

4(1) Operation for the MLF
We started a new operation run on April 4, 2018 at
400-kW beam power for the MLF user operation. The
beam power increased to 500 kW on April 19. The same
beam power was maintained during FY2018 except forthe startup and tuning/study.
After completion of the user operation before thesummer shutdown, we had a study time in the beginning of July 2018. During that time, we successfully
13
demonstrated 1 MW equivalent (8.3 × 10 protons per
pulse and 25 Hz) and one-hour duration operation for
the MLF. The 1-MW demonstration took place for the
first time in January 2015 as a single shot operation.
Those results were the starting point of our work toachieve a continuous 1 MW operation.
Although the MLF beam power remained at 500 kW
before and after the summer shutdown, the linac beam
current was increased from 40 to 50 mA, which was anominal current for 1 MW operation.
The shutdown period before and after the newyear holidays was slightly longer than normal and continued from the end of December to mid-January. We
had a power outage in the end of December due torefurbishment of an old power station of the Nuclear
Science Research Institute of the Japan Atomic Energy
Agency, to which our power line is connected. In midJanuary, the MLF did not accept the beam because of
the transportation of a used neutron production target
to the storage building. We started the linac tuning on
January 18, followed by the RCS and the MR tuning. The
MLF user program started on January 23 and ended on
March 26, as scheduled.
(2) Operation of the MR for the Neutrino Experiments(FX mode) and Hadron Experiment (SX mode)
The operation of the MR before the summer shutdown in 2018 was stable. The MR delivered beams to
the NU at about 490 kW by the end of May. Then we
switched the extraction mode from FX to SX andstarted tuning for the HD. We smoothly ramped up thepower to 51 kW and the user program ended on June
29 before the summer shutdown.
The beam operation of the MR was suspended in
the period from October to December due to improvement work on the experimental facilities: refurbishmentof the Super-Kamiokande detector for the Neutrino
experiment, and maintenance and upgrade work on

the HD facility. During the beam suspension, a realistic
test was carried out for a new magnet power supply fora future upgrade.
In January, we had a short (3-day long) machine
study of the FX. Then, the beam tuning for the HD
started in February, followed by the user program. The
beam power was 51 kW as in the previous HD run inJune 2018. The user program ran smoothly until March
18, when one of the bending magnets (named B15D)
had a failure in the beam transport line from the RCS
to the MR. The cause of the failure was a layer short ofa coil.
The operation statistics for FY2018 (from April 2018
to March 2019) are shown in Table 1 and Fig. 2. The total
operation time, which was defined as the shift leaders’
on-duty time at the control room, including startup
and RF conditioning, was 5,824 hours. The net user
operation hours and the beam availability rate for eachexperimental facility were as follows: 4,129 hours (94%)
for MLF; 1,053 hours (86%) for NU; and 1,089 hours(74%) for HD. These statistics show that the linac andthe RCS operated properly. The cause of the low availability for the HD was the B15D trouble in March 2019.
The downtime by components is shown in Fig. 3.
There were several causes of the downtimes. Over thelast few years, we have taken many countermeasuresagainst troubles at the linac: stabilization of the cooling water flow, inside cleaning of some SDTL cavities,
replacement of old bias power supplies for the klystron high voltage power supply system (HVDC). We still
had a long HVDC down time, due to a failure of the old
324 MHz klystron.
There were no serious downtime events at the
RCS. Discharges in the high voltage cables in the kicker
magnet system were one of the major causes for theoccasional minor interruptions.
The MR had several troubles: cooling water flow
drop (QM), timing signal distribution system trouble(BM), vacuum tube failures (RF), oil leakage at the outside transformer (Injection). The longest down time
(324 hours, out of the range) was due to a problem with
the B15D magnet in the “Others” category.
Most of the improvement and upgrade work
was carried out during the summer shutdown. These
improved items, major causes for downtime, and beam
power history are described in further chapters.

J-PARC Annual Report 2018

Accelerators

5
Table 1. Operation statistics in hours for FY2018. Figures in the parentheses in trouble
columns show the lost time as a percentage.
Facility

User Time(hours)Trouble, Acc.only(hours)Trouble, Fac.only(hours)Net Time(hours)Availability, Total
(%)

MLF

4,388

252 (5.7%)

6 (0.1%)

4,129

94.1

Neutrino
(FX)

1,224

149 (12.2%)

22 (1.8%)

1,053

86.0

Hadron(SX)

1,477

366 (24.8%)

22 (1.5%)

1,089

73.7

For MLF users

For MR users

Srartup, etc. (1),379

Trouble (Exp), 6
Trouble (Acc), 252

LINAC/RCS Tuning,
Study, 860
LINAC/RCS
Tuning, Study,
793

3NBT/MLF Tuning,
Study, 196

LINAC/RCS Tuning,
Study, 860

Srartup, etc. (2),1934

Trouble,66

3NBT/MLF Tuning,
Study, 190
Trouble,5

MLF Users,
4129

LINAC/RCS
Tuning, Study,
793

350BT/MR/FX/SX
Trouble,Tuning, Study, 322
66
Trouble, 5
NU Users,
1053

Trouble (Exp), 21
Trouble (Acc), 365

350BT/MR/FX/SX
Tuning, Study, 328

HD Users,
1089

NU Users (Tot),
1224

Trouble (Acc), 148
Trouble (Exp), 21

MLF Users (Tot),
4388

HD Users (Tot)1477

Fig. 2. Operation statistics for FY2018. The total operation time was 5,824 hours.

Fig. 3. Downtime by components in FY2018.

Accelerators

J-PARC Annual Report 2018

6

Linac

Fig. 4. Operation history of the ion source in FY2018.

Overview
The J-PARC linac has been operated with a nominal peak beam current of 50 mA since October 2018.
High availability of approximately 94% (to the MLF)
was achieved during FY2018 at the linac. Three 10-hourlong beam stop events occurred due to the failure ofa 324-MHz klystron, an ion source antenna and a klystron anode modulator. The number of trips due to the
RFQ and the beam loss monitor (BLM) was still higher
than that of other components. In the summer of 2018,
we reconsidered the high voltage and the impedanceof proportional counters for the BLM not to detect theevent considered to be misfired (e.g.: fired by only one
BLM). As a result, the trip rate due to the BLM decreased
dramatically from 15-20 a day to a few a day. No increasein the activation of the accelerator components causedby this measure was observed.
Accelerator components status
The operation history of the ion source in FY2018
is shown in Fig. 4. We have gradually increased the continuous operation time of the ion source. In RUN#79,
a continuous operation of approximately 2,200 hours
was achieved with the typical beam current, pulse
length and repetition rate of 47 mA, 300 μs and 25 Hz,
respectively. After the 2018 summer shutdown, thepeak current from the ion source increased to 60 mA
so that the linac could inject the beam current of 50 mA
into the RCS. At the end of RUN#79 and RUN#80, the ion
source extracted stable 72 mA beams for high- intensity

beam studies at the linac. In the RUN#81, unscheduled ion source replacement was performed due to anantenna malfunction during the operation.
Figure 5 shows the time variation of number of RFQ
trips. We suppose the origin of the trip is the sparking
between vane tips, which had been contaminated bycarbon-related contaminants. Since the cryopumps
installed at the RFQ have the potential to improve thevacuum condition, the vacuum ducts for the cryopumps
were changed to manifold-type configurations in
the 2018 summer shutdown. As a result, the vacuum
pressure in the RFQ decreased by 20%. No significant
improvement in the trip rate has been seen so far, but
we will observe the trend in a long-term operation.
After the Great East Japan Earthquake in 2011, we
could not input the design rf power into some SDTL
cavities due to the multipactor effect. To improve thissituation, we have polished the inside of the cavities
by using acetone during the summer shutdown since2015. After the treatment, the multipactor region disappeared completely, except in the SDTL05A cavity. We
think that the SDTL05A was not cleaned up sufficiently,
therefore we are going to retry the cavity cleaning of
the SDTL05A in the summer of 2019.
The operation of the ACS cavities was more stable
than the one of the other cavities. The number of tripsof all the ACS cavities was less than once per day. In thesummer of 2018, we replaced an RF window of one ACS
cavity with a brand-new one in order to check the surface condition of the RF window, which has been used

J-PARC Annual Report 2018

Accelerators

7

Fig. 5. Time variation of the number of RFQ RF-trips.

for about five years. The visual observation confirmedthat the window has remained in good condition. We
think that a periodical replacement of the ACS RF window will not be necessary for the next few years.
The RF chopper system, which is installed justafter the RFQ, consists of two RF-deflecting cavities
and a beam scraper. During every summer shutdown,
we removed the used scraper from the beam line andmeasured the depth of damaged area using a laser
microscope. After a 300-kW single bunch 2-month
operation and a 400-kW single bunch 3-month operation, the depth of the damaged area was observed tobe 0.7 mm. The result shows the depth can be evaluatedto be approximately 1 mm in the case of a 9-month continuous 1-MW operation. This is tolerable level because
the beam axis thickness of the scraper is 40 mm.
Klystron system status
We have been using two types of klystrons, suchas a 324-MHz klystron and a 972-MHz one. The operation times of the two types of klystrons as of March
2019, are shown in Fig. 6. Eight out of twenty 324-MHz
klystrons reached approximately 65,000 hours of operation, which has been the entire period since the linac
operation was started. Most of the 972-MHz klystrons
exceeded 30,000 hours of operation. In FY2018, one ofeach type of klystrons was replaced due to their performance degradation. A test-stand for the klystrons wasbuilt to perform off-line conditioning before installation in order to save replacement time. The test-standwill start to operate at full capacity in FY2019.
Beam monitor development
For higher intensity beam measurement, we havefocused on a carbon nanotube (CNT) wire with its highFig. 6. T he operation time of the 324-MHz klystron (upper)and 972-MHz klystron (lower) as of March 2019.

Fig. 7. Wire scanner monitor head equipped with a CNT wire.

tensile strength and electric conductivity. A new wire
scanner monitor (WSM) based on the CNT wire (CNTWSM) was developed, as shown in Fig. 7. The result of
the off-line beam test showed that the CNT-WSM had
the same dynamic range as the carbon-wire-type WSM,
which has been used at a beam transport between the
RFQ and the DTL. In the summer of 2018, we installed
the CNT-WSM at the MEBT1 section. Currently, the CNTWSM works without any issues at the beam line.
To conduct more precise beam studies by measuring a longitudinal beam profile, since 2016 we haveAccelerators

J-PARC Annual Report 2018

8
implemented the plan to install three bunch shapemonitors (BSMs) at the ACS section. The last BSM wasinstalled in the summer of 2018, and the installation
program at the ACS section was completed.
Beam study
The beam studies have been performed to resolve
some issues such as the Intra-Beam Stripping (IBSt)
mitigation in the ACS section, the momentum stability
at the linac exit, the precise beam measurement at the
MEBT1, and so on.
The dominant source of the beam loss is foundto be IBSt in H beam in the ACS section. Because theloss rate by the IBSt can be affected only by a beam
optics, some optics with the different temperature ratio
between transverse and longitudinal planes (Tx/Tz)
were examined. Numerical simulations and the beam
study results showed that the loss rate with Tx/Tz=0.7
optics was 40% lower than that with Tx/Tz=1.0, which is
the J-PARC linac baseline design based on the equipartitioning setting. The Tx/Tz=0.7 optics will be applied tothe operation from April 2019.
We are considering a further upgrade plan toincrease the RCS beam power to 1.5 MW. To realize theupgrade plan, the beam current and the beam pulse
length must increase to 60 mA and 600 μs respectively.
The first 400-MeV and 56-mA beam at the linac exit wasdemonstrated in December 2017. In this demonstration, a significant decrease of the beam transmission
was observed in the RFQ and the beam scraper ofthe RF chopper system. At the second demonstration,
which was conducted in July 2018, we increased the
RFQ tank level and expanded the scraper gap without
affecting the extinction in order to improve the beamtransmission. At the demonstration, the beam current
from the ion source was also increased from 68 mA to
72 mA. By applying these measures, we successfully
obtained 400-MeV and 62-mA beam at the linac exit,
as shown in Fig. 8. A numerical simulation showed thatthe reduction of the beam halo from the ion source was
effective in improving the RFQ transmission. Further
high-intensity beam studies will be conducted.

Fig. 8. R
 esult of a 400-MeV and 60-mA demonstration at the
linac.

J-PARC Annual Report 2018

Accelerators

9

RCS
Operational status
In JFY 2018, the operation beam power of RCS
was started at 400 kW for the MLF. It was immediately
increased to 500 kW at the end of April and maintainedat that level during JFY 2018, except in the beginning of
October. Meanwhile, the MR output power was steadily
increased as the MR commissioning progressed.
Figure 9 shows the change in the RCS output powerwith respect to time.
This year, there were no serious problems in the
RCS. The major problems were the discharge of Pulse
Forming Network (PFN) cables in the kicker magnet
system. The discharges occurred twice, and we were
not able to recover quickly. Therefore, after the second
discharge incident the bump orbit made by the correction magnets near the extraction area compensatedthe shortage of the kick angle. Although the loss atthe septum magnets increased several times over theusual operation, the dose rate was usually 100 mSv / hor lower, so we considered it acceptable and continued
the operation under this condition. The dose after theoperation was within the expectations.
400 kW

500 kW

300 kW
startupFig. 9. Changes in the RCS output particles over time.

The availability of the RCS was summarized in the
Table 2. The operation time for the MLF over the year
was approximately 4130 h, excluding the commissioning time, and downtime of approximately 54 h;
therefore, its overall availability was 98.4%. For the
Neutrino and Hadron users, the availability of RCS was
almost the same as in the MLF case and the availability
value was around 99%.

Table 2. Summary of the availability
Facility

User time(hr)Trouble in
RCS (hr)

Availabilityof RCS (%)

MLF

4129:46

53:52

98.4

Neutrino

1053:32

8:28

99.2

Hadron1089:28

3:06

98.9

Maintenance and improvements
1) Foil production
In J-PARC RCS, The Hybrid type thick Boron-doped
Carbon (HBC) foil was used for charge exchange injection. It had been produced in KEK laboratory since thebeginning of RCS commissioning. However, due to theretirement of the expert of the HBC foil production, thefurther manufacturing of the HBC foil in KEK became
problematic. Therefore, the foil deposition system
in KEK was moved to the J-PARC site to continue the
HBC foil production. By using this system, we started
research and development to produce more robust foil.
With some trial-and-errors, we produced new HBC
foil. The performance of the new HBC foil was evaluated by using the heavy ion beam facilities in Takasaki
Advanced Radiation Research Institute of National
Institute for Quantum and Radiological Science andTechnology before installing it in the RCS. The test
result indicated that the new HBC foil would be almost
as durable as the original KEK HBC foil. Finally, one new
foil was tested during a 10-day user operation on June
2018, and it endured during this period. As a result, wehave been using this new HBC foil from October for thefull user operation. Figure 10 shows the new HBC foil
before and after a 2-month operation.
2) Movable collimator installation
The beam collimation system removes the beam
halo and localizes the beam loss to preserve the otheraccelerator components. The collimation system comprises one primary collimator, which scatters the halo
particles, and five secondary collimators, which absorb
those scattered particles. The radiation shielding
around the collimator chamber was designed in a waythat allowed the collimator system to absorb a halo of
up to 4 kW.
In April 2016, a malfunction occurred in the VME
system, i.e., the collimator’s control system, and thismalfunction caused a vacuum leak.
After an investigation, it was found that the fifth
secondary collimator was the source of the leak, which

Accelerators

J-PARC Annual Report 201810
the residual doses in the RCS were relatively larger thanthose in previous years.
Table 3 summarizes the radiation doses received
by the workers during the summer shutdown period
in 2018. A total of 49 workers were exposed to dosesof more than 0.01 mSv, and their collective dose was
2.50 man-mSv. Eight workers were exposed to residual
doses of more than 0.1 mSv, and the maximum dose
received by any one worker was 0.24 mSv. Both the collective and maximum doses increased compared toprevious years.
Table 3. Summary of worker radiation doses during the summer shutdown period in 2018.

Fig. 10. T he new HBC foil before (upper) and after a 2-month
operation (lower).

was caused by a collision of the collimator blocks. We
installed a spare straight duct, instead of repairing thebroken collimator, for quick recovery.
After the user operation resumed, the residual dose
was not as high as expected. Thus, we continued theuser operation until the summer shutdown in 2016
under this condition. Following our temporary repair,
we made a fixed collimator to replace the spare duct,and installed it during the summer shutdown period
in 2016. During JFY2017, we improved significantly thereliability of the collimator moving system. The control
system was changed from VME to PLC, and it included
a redundant limit (software and hardware). The hardware was also improved to separate support point andvacuum boundary, and horizontal and vertical collimator positions are alternating to prevent hitting each of
the collimator blocks. Finally, we installed a new fifth
movable collimator system in the summer shutdown
period in 2018.
Residual dose distribution and exposure during
maintenance
Since the output power to the MLF was increased,

Dose (mSv)

Number of workers

0.01–0.05

36

0.06–0.10

5

0.11–0.20

6

0.21–

2

1-MW TRIAL
At the beginning of July 2018, we carried out thetrial of the 1-MW continuous operation. As a matter offact, just before the 1-MW trial, we had a failure of theturbo molecular pump (TMP) at the arc section. This
trouble caused contamination near the TMP failure
point. Therefore, at the 1-MW operation, the pressure
rises were slightly more than one order of magnitude,
but three orders of pressure rise were found at the
TMP failure point. Because of this vacuum deterioration, the signals of the beam loss monitors around the
TMP failure point increased, and sometimes the beam
was stopped due to the machine protection system.
However, those signals were actually caused by theinteraction between the beam and gas. Thus, there
were no significant changes of the residual dose values
before and after the 1-MW operation. Figure 11 shows
the residual dose around the RCS tunnel before andafter the 1-MW continuous operation.
Beyond 1-MW: Beam injection study
The result of the 1-MW demonstration showedthat the beam loss in RCS was well controlled and RCS
would have enough potential to accelerate a beamwith power of more than 1 MW. Therefore, we carriedout the trials beyond the 1-MW acceleration. However,the RF system in RCS does not have enough capacity
to completely accelerate a beam more powerful than

J-PARC Annual Report 2018

Accelerators

11

Fig. 12. B eam loss monitor signals observed at the collimator
section.

Fig. 11. Residual doses in RCS before and after the 1-MW
demonstration.

1 MW. The simulation results indicated that the present
RF system can accelerate stably only a 1.2-MW beamjust in the first 10 ms.
Thus, in JFY2018, we carried out the 1.2-MW beamtrial with acceleration energy of 1 GeV. In this case,the beam was accelerated during the first 6.75 ms andimmediately extracted after acceleration. After fine tuning under this condition, we obtained enough low-loss
beam condition. Figure 12 shows the beam loss monitor
signals with various beam power. This figure indicatedthat the signal intensities are almost proportional to thebeam power.

Summary
The user operation at RCS has been enough stable. At present, RCS delivers 4.4e13 ppp, which wereequivalent to 500-kW beam to the MLF and 6.5e13 ppp(780-kW equivalent in RCS) beam to the MR. It will befurther increased step by step with carefully monitoring
the neutron target status and the beam loss.
We achieved a 1-MW, 1-hr continuous operationin the beginning of July 2018. The 1-MW trial indicatedsome issues hindering a stable 1-MW operation. We
will resolve those issues.
Trials beyond 1-MW were carried out. The results
indicated that RCS had enough capability to accelerate
a 1.2-MW beam if the RF system would be reinforced.
Currently, we have been working on improvements of
our RF system.

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J-PARC Annual Report 2018

12

MR
Overview
The Main Ring synchrotron (MR) of J-PARC accelerates the 3-GeV beam injected from RCS up to 30 GeV.
The 30-GeV proton beam is supplied alternatively to theneutrino experimental facility in a 2.48-s period, whichis called fast-beam extraction (FX) mode, and also to thehadron experimental facility in a 5.20-s period, which iscalled slow-beam extraction (SX) mode.
The operation of MR was stable before the summer
shutdown period in 2018. For the neutrino experimentin the FX-mode, MR successfully maintained the 490kW stable operation and delivered a 500-kW, 50-shots
trial with an acceptable beam loss. For the hadronexperiment in the SX-mode, MR also achieved a 51-kW
stable operation.
The MR operation after the maintenance period
was resumed from January 2019. After the 3-day beam
study in the FX-mode, the user operation with the
SX-mode was started by using the 50-kW beam. The stability of the beam was satisfactory. However, a problem
occurred in the bending magnet of the beam transportline from RCS to MR on March 18, 2019, caused by ashort circuit between the layers of the magnet coil. It
was fixed temporarily by making a bypass circuit forthe shorted layer. (However, the beam operation was
suspended in April again because another short circuit
happened in other coil layers after three weeks of operation. Thus, MR has been suspended until the arrival ofa new coil. It will be delivered in September 2019.)
As part of our plan for the future beam upgrade atMR, we continued the testing of a new bending-magnet power supply with higher repetition rate by using
the real magnets in the MR tunnel. The test was conducted during the shutdown period in 2018, which wasapproximately twice as along as the usual one due toadditional work to improve the experimental facilities.
The long shutdown period is shown in Fig. 13 as theblank in the MR beam power history.
The details of the subjects described above are
explained in the following section.
B15D magnet trouble
The bending magnet B15D in the 3-50BT line
between the RCS and the MR had a layer short-circuit on
March 18, 2018. It was noticed by the beam loss inducedby the horizontal beam orbit deviation measured at the
spot just after the B15D magnet. As the magnet current did not change at that time, a coil problem wasFig. 13. MR beam power history (JFY2018)(JFY2018: April 2018 – March 2019)
There was a long shutdown period from July to
December of 2018.

suspected because the beam orbit was shifted by thechange of the magnetic field in the magnet.
The B15D magnet is shown in the Fig. 14. B15D
has two coils, an upper and a lower. Each of the coils
consists of 5-unit coils. The unit coil is composed of twolayers of 12 turns hollow conductor, as shown in Fig. 15.
It was confirmed that the first unit of the lower coil has
a different impedance from that of the others. Thus, anelectric terminal, which bypasses the first unit, was connected as a temporary repair. (As a result, we could start
the SX-mode operation. However, the second unit had
the same problem in the end of the following month.)
It was assumed that the short circuit was induced by
the water leakage from the joint of the hollow coils. The
assumption will be verified after removing the coil.
The user operation period suspended by the B15U
trouble will be compensated after the summer shutdown in 2019.

Fig. 14. B15D bending magnet

J-PARC Annual Report 2018

Accelerators

13

Fig. 16. DCCT output of the 500-kW beam
Fig. 15. Schematic view of the coil structure

SX-mode operation
The SX-mode operation of JFY2018 was stable
except for the trouble with the B15D magnet. The beam
power of 50-51 kW was maintained.
The spill duty factor, which is a very importantparameter for the hadron experiments, has been
improved from 50% to 55% by fine tuning of the transvers RF pattern, which makes the beam distribution
uniform.
FX-mode operation
The beam power of 490 kW was achieved for the
FX-mode user operation. The beam loss of the 490-kW
operation was approximately 50 W along the 3-50BT
line and 480 W in the ring. These values are sufficiently
small.
A 500-kW trial was carried out as a beam study. 50
shots of 500-kW beam were successfully accelerated
and extracted to the neutrino facility. The observed
beam loss in the ring was 700 W. An example of the
DCCT data for the 500-kW beam is shown in Fig. 16.
The red line shows the number of protons in the ring. It
keeps a constant value after the injection, which meansthat there is no significant beam loss. Although theamount of the loss may be acceptable, it is planned toperform the iterative tunings of several parameters forless losses and better loss localization.
New magnet power supply
Three of the new power supplies for the MR bending magnet have been installed in the new power
supply buildings.
Each of them supplies the current to 16 magnets,
which are 1/6 of the bending magnets in MR. The basic
test of every component has been done. Then, therealistic test was carried out by using the real bending
magnets in the tunnel in JFY2018.
The examples of the data are shown in Fig. 17 for
the FX-mode and in Fig. 18 for the SX-mode, respectively. Blue lines in the figures show the output current
pattern of the power supply. For the FX-mode, thedesigned repetition period of 1.32 s was achieved. It is
required to increase the beam power for the FX-mode

Fig. 17. O
 bserved FX mode current pattern Repetition period
is 1.32 s.

Fig. 18. O
 bserved SX-mode current pattern The repetition
period is 4.16 s.

Accelerators

J-PARC Annual Report 201814
up to the original design beam power of 750 kW andmore. For the SX-mode, it was confirmed that the current ripple on the flat top was approximately one ordersmaller than that of the present power supply. It is sufficiently small for the hadron experiment. In the next
step, the durability of the power supply will be checkedby long time operation.
Summary
For the FX-mode, the beam power of 490 kW was
maintained for the user operation and 50 shots of the
500-kW beam were achieved by the beam study. For

the SX-mode, the beam power of 51 kW was achieved
for the users.
However, the MR operation has been suspended by
the coil trouble of the bending magnet in 3-50BT line.
The operation will be resumed after the summer shutdown period in 2019.
The work on mass production of magnet power
supply has advanced. The results of test operation of
the new power supply for the bending magnet, using
the real magnets in the MR tunnel, show the sufficient
power and stability we expected.

Materials and Life Science
Experimental Facility
Overview
In fiscal year 2018, the operation of Materials andLife Science Experimental Facility (MLF) started with
the neutron production mercury target (#8), which had
helium bubbling system. On April 19, the proton beam
power delivered to the target was increased from 400
kW to 500 kW and the operation continued very stably
until July 2, 2018, followed by a 1-MW test operationfor one hour on July 3. The beam availability of the target (#8) to the scheduled beam time was 93%. In thesummer maintenance period, the target was replaced
from #8 to #9 and the neutron production started on
October 22 and continued stably until March 26, 2019.
The muon rotating target system has been delivering a stable muon beam to users without trouble since2014. However, the potential damage of a flexible joint
for transferring motor rotation to the graphite disktarget has been a cause for concern. Some measures
were taken to minimize the potential hazards expectedin case of suspended target rotation. By ensuring thatthose measures were effective, the muon user program
was resumed in the beginning of November after two
weeks delay behind the original schedule. The operation continued until March 26, 2019, without troubles.
Due to the stable operation of the facility, the MLF
was able to produce many excellent outcomes in various research fields, such as hard matter, soft matter,energy materials, engineering materials, biomaterials
and so on. In addition to the research outcomes, there
were many activities in the MLF in 2018 to enhance thecollaboration with international/ domestic users in academia and various industries. The Annual meeting ofindustrial application at J-PARC MLF was held on July 23
and 24 at Akihabara Convention Hall. The 3rd Neutronand Muon School was held from November 20 to 24.
The 3rd ESS-J-PARC Workshop was held from November
13 to 15. On the first day of the workshop, the Swedish

Materials and Life Science Experimental Facility

J-PARC Annual Report 201816
Ambassador Magnus Robach delivered his greetings.
Quantum Beam Science Festa which is a conference
mainly for domestic users for MLF J-PARC and IMSS KEK
was held in Tsukuba on March 12 and 13.

In the annual report, the research highlights, thetechnical developments and the collaboration activities with users in 2018 are described in detail.

Progress of the Neutron Source Section
Fiscal year 2018 started with a beam operation of
500 kW, which had been recognized as an importantmilestone to reach the final goal of 1 MW, because twotargets failed consecutively during 500 kW beam operation in 2015 and, since then, considerable efforts were
put into the design improvements of the next mercury
target, target #8, to make it more robust and reliable
during a high-power operation. Target #8 had beenused at 300 kW and 400 kW since the last fiscal year andcompleted its user beam operation successfully on June30, 2018, after a 3-month operation at 500 kW, which
demonstrated the validity of the design improvement.
In addition to that, target #8 was operated with 935 kW
for one hour at the high-power beam study held on
July 3. Reaching almost 1 MW within practical duration
time was a great achievement of the J-PARC.
Gas-micro-bubbles injection into mercury and thehigh-speed mercury flow in a narrow channel formedby the double walled structure, shown schematicallyin Fig. 1, are the key measures to mitigate the pitting
Protonbeam

Hg

Double walled

Swirl bubbler

Displacement velocity [m/s]Fig. 1. Measures to mitigate the pitting damage equipped intarget #8

0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0

damage at the beam window which is the front end of
the target vessel. At the high-power beam study, thevibration of the target vessel under the beam operation condition of 25 Hz was measured at almost 1 MW
for the first time, as shown in Fig. 2. The displacement
velocity on the top side of the target vessel at 935 kW
remained on the same trend line with that measured ata lower beam power. It shows the efficacy of gas-microbubble injection to reduce the displacement velocity at
the 1-MW operation.
The specimens were taken out of the used target#8 and the maximum depth of pitting damage on the
inner side of the beam window was 18 µm, which wasless than anticipated. This fact demonstrated the effectiveness of the present measures to mitigate the pitting
damage. Then, target #8 was replaced with target #9,
which has the same structure as target #8. The beam
operation of target #9 had continued well at 500 kW
with the high average availability of 93.5% as of the endof fiscal year 2018.
An important event was the transportation of
the used target vessel from the MLF (Materials andLife Science Experimental Facility) to the RAM (Radio
Activated Materials) building to save the limited spaceof the used components storage room in the MLF.
A shielding container, 200 mm in wall thickness and
44 tons in total weight, was fabricated, and used in combination with the shipping container fabricated in 2017.

W/O micro-bubbles

With micro-bubbles

0200

400 600
800
Beam power [kW]1000

Fig. 2. Displacement velocity at the top side of target vessel#8 at beam study

Shipping container
Fig. 3. Transportation of a used target vesselJ-PARC Annual Report 2018Materials and Life Science Experimental Facility

17
The preparation and rehearsal took almost a month andthe used target vessel was transported successfully to

the RAM building for the first time on January 16, 2019.
The transportation is going to be held every year.

Neutron Science Section
1. User program
For the general-proposal round for 2018A, 175
general proposals and 5 new user promotion (NUP) proposals were approved from 260 submissions. Amongthem, 174 approved experiments and 9 reserved ones
were executed. For 2018B, 190 general proposals and
8 NUP proposals were approved from 285 submissions. Among them, 178 approved experiments and
13 reserved ones were executed. Additionally, four
newly approved long-term proposals started a 3-year
project in the 2018B term. Fast Track Proposal, which
is a mail-in program, has just started from the end of
JFY2017 for Super HRPD at BL08 and NOVA at BL21.
In 2018, 3 experiments were executed at BL08 and2 experiments were done at BL21.
2. Instruments
This year, the MLF was stably operated with powerof 500 kW. On July 3, a test operation with 1 MW power
was performed for one hour. The high power was
experienced in each beam line. On 4SEASONS and
AMATERAS, inelastic neutron scattering from S=1/2
one-dimensional antiferromagnets were measured by3
using small samples of 0.3~0.5 cm . The dispersion relation of the spin excitations could be identified in themeasurement for a few minutes, and well-analyzable
data were obtained for only one hour.
After the beginning of the user program in the
MIEZE part of the neutron spin-echo suit VIN ROSE
at BL06 in 2017, scientific outcomes are starting toemerge. An experiment was performed in MnSi, where
various spin structures, such as helical spin structure,
conical spin structure, and skyrmions, were expected
below the transition temperature. Clear spin relaxation
was successfully observed just above the transition
temperature.
3. International activities
The 3rd Neutron and Muon School was held from
November 20 to 24. 35 young researchers and graduate students from China, India, Korea, Tahiland, Russia,
K. Nakajima1, Y. Kawakita1, S. Itoh1, 2 and T. Otomo1, 2
1United Kingdum, as well as Japan, participated in theschool. The neutron science group contributed 9 neutron instruments for hands-on experiments (Fig. 4).
The J-PARC Center and CROSS hosted the J-PARC
Workshop “Deuterium Labeling Study for Neutron
Science” on January 15 and 16, 2019. We invited Dr.
T. A. Darwith from ANSTO and 20 scientists discussed
neutron studies on material and life siences by utlizing
deuterium labeling.

Fig. 4. Dr. Hiroi explaining the operation of the shutter
control pannel at TAIKAN at the 3rd Neutron andMuon School hands-on experiment.

4. Resultant outcomes
The research activities in neutron science at the
MLF resulted in more than 180 papers and 10 press
releases. The number of papers includes articles in
influential journals such as Nature Physics (1), Nature
Materials (1) and Scientific Reports (6). Press releases
include two detector developments, such as a highresolution (~11 nm) emulsion type detector and ahigh-speed neutron imaging detector via a solid-statesuperconducting detector.
Dr. Takuro Kawasaki won the 16th Young Researchers Prize of the Japanese Society for Neutron
Science for the development of stroboscopic measurements and leading research with the technique on
SENJYU (BL18) and TAKUMI (BL19).
RADEN (BL22) group won JAEA President's Awardfor the development of energy-resolved neutron imaging and leading researches on RADEN.
2

Neutron Science Section, Materials and Life Science Division, J-PARC Center; Institute of Materials Structure Science, HighEnergy Accelerator Research Organization, KEKMaterials and Life Science Experimental Facility

J-PARC Annual Report 201818

Neutron Device
As one of the activities at the Neutron Instrumentation Section of the MLF Division, research anddevelopment of a neutron polarizing supermirror withhigh-performance capabilities, such as wide bandwidth, high polarization, and availability at low external
fields, has been conducted to meet a variety of researchdemands in the MLF. Fundamental study, includinginteractions between sputtering gas particles andgrowing layer, thin film magnetism, and characterization of the in-plane magnetic structure of multilayers
for polarizing supermirrors using polarized neutron
scattering, is required to develop the high-performancepolarizing supermirror.
For ion beam sputtering (IBS), an Fe/Ge multilayershows higher polarization than Fe/Si and is suitable fora polarizing supermirror. However, the reason for thatphenomenon had not been fully understood. In thepresent study, the multilayer structure of the Fe/Ge
and Fe/Si multilayers fabricated by IBS was investigatedusing the polarized neutron reflectivity measurement
and scanning transmission electron microscopy withenergy-dispersive X-ray analysis (STEM-EDX). Figure 5
shows the polarized neutron reflectivity profiles of the
Fe/Si and Fe/Ge multilayers. One can see that the Fe/Ge
multilayer shows higher polarization than the Fe/Si, as
expected. The scattering length density (SLD) profiles,
obtained by the fit to the reflectivity data, revealed that
the SLD reduction in the Ge layer by 13% contributeto the SLD contrast between Fe and Ge layers almost
vanishing for spin-down neutrons, as shown in Fig. 6.
This accounts for higher polarization of the Fe/Ge multilayer. In addition, the STEM-EDX measurement showedthat the incorporation of Ar sputtering gas particles,
backscattered at the target, is responsible for a marked
reduction in the SLD in the Ge layer.
The above investigations motivated us to fabricate
an Fe/Ge neutron polarizing supermirror with 4994
layers (m = 5). The result of the polarized neutron reflectivity measurement is shown in Fig. 7. The reflectivity
for spin-up neutrons was higher than 0.70 for the range−1
qz ≤ 1.085 nm (m = 5), as designed. The polarization
was higher than 0.972 for 0.217 ≤ qz ≤ 1.085 (1 ≤ m ≤ 5).
These results open a possibility for fine-tuning of the
SLD for the IBS, which is required to realize a high polarization efficiency of a neutron polarizing supermirror.
The mirror is planned to be tested at BL22 and BL17 of
the MLF.

Fe/Si

Up spin

Down spin

Fe/Ge

Up spin

Down spin

Fig. 5. Polarized neutron reflectivity profiles of Fe/Si and Fe/
Ge multilayers.

Fig. 6. Estimated scattering length density profiles of the Fe/
Si and Fe/Ge multilayers for spin-down neutrons.

Fig. 7. Polarized neutron reflectivity profiles of Fe/Ge polarizing supermirror with 4994 layers.

Reference[1] R. Maruyama et al., Nuclear Inst. and Meth. Phys. Res., A888,
70 (2018).

J-PARC Annual Report 2018Materials and Life Science Experimental Facility

19

Muon Section
Rotating target system: concern after delight
The muon rotating target system is at the heart of
the MUSE facility, located on the primary proton beamline of MLF. It consists of a large disk made of graphite,
where the radiation damage due to the 3 GeV proton
hitting at off-center position is relieved by spraying it
along the circumference upon rotation. Since its installation in 2014, the target system has been enjoying stable
operation, delivering muon beam to users with everincreasing flux according to the proton beam powerthat reached 500 kW this year. While the system wasdesigned to allow a 1-MW operation, the day came totest the actual performance when the beam power was
temporally ramped up to 1 MW for one hour towards
the end of the accelerator operation in early July. The
target team was delighted to confirm that the parameters monitoring the status such as target temperatureand motor torque met exactly the expectations.
Meanwhile, later, during the summer maintenance,
the team identified a potential damage of a flexible
coupler for transferring motor rotation to the graphite
disk. This cast a serious concern about the possibilityof unexpected suspension of the target rotation due to
breakdown of the coupler. The option of replacing thewhole target system with a brand-new spare one was
excluded to avoid the risk of delays in the beam delivery schedule. Based on the numerical simulations of thetemperature and stress of still graphite disk exposed toa 500-kW proton beam, some measures were taken tominimize potential hazards expected in case of suspended target rotation. In particular, buffer tanks forFig. 8. Exhaust-gas handling system installed on the back of
vacuum pump for proton beamline evacuation. It consists of two branches with buffer tanks to accumulate thetritium-contaminated exhausts for controlled emission.

exhaust gas (potentially contaminated by tritium emitted from the target) were installed behind the vacuum
pump system connected to the proton beamline to prevent its direct emission to the environment (see Fig. 8).
Upon ensuring that these measures were in effect, themuon user program was resumed in the beginningof November after two weeks delay from the originalschedule.
Feasibility of negative muon spin rotation demonstrated on D-line
Positive muons have a great advantage over negative muons for probing magnetic field in matter, as thespin polarization for the former remains much higher
than the latter. However, it has been demonstrated thatnegative muons could be useful in studying hydrogen
diffusion in magnesium hydride (MgH2).
The rotational motion of muon spins (the Lamour
precession) monitored by muon decay into positrons/
electrons tells the magnitude and distribution/fluctuation of internal fields that carries information on
nearby atoms exerting magnetic fields to muons. In
MgH2, while the diffusion of hydrogen ions (exerting
magnetic fields to muons) within the material shouldcause such fluctuation, the possibility of self-diffusionof positive muons as pseudo-hydrogen (that also leads
to the fluctuation of the internal field) makes it difficult
to discern the cause of fluctuation. By using negative
muons, deeply bound to magnesium nuclei as “heavy
electrons”, researchers succeeded in observing thefield fluctuations that might be uniquely attributed tohydrogen diffusion (see Fig. 9). The result also provedthat the disadvantage of low spin polarization for negative muons could be overcome by their unprecedented
high flux achieved at the D-line under the 500-kW
operation.
Construction of electric power substation for H-line
in progress
Among the muon beamlines envisaged in the original plan of the MLF, the H-line in experimental hall No. 1
has been in the stage of waiting for funding from MEXT
for years. Because of this situation, the J-PARC headquarters decided to provide partial support for putting
the plan forward. It will finance primarily the construction of a new electric power substation to cover thehuge demand for electricity expected after the H-line
becomes fully operational. Following the installation

Materials and Life Science Experimental Facility

J-PARC Annual Report 201820

Fig. 9. Time-dependent decay electron asymmetry observed
under various external fields upon negative muon implantation in MgH2. (after J. Sugiyama et al., PRL 121,
087202: ©APS)

Fig. 10. A snapshot of the construction site for the electric power
substation at the east side of the MLF building (October
2018).

of cable racks, pitting of the MLF building wall, and outdoor structures in FY2017, the civil engineering workfor the substation site near the MLF building continued(see Fig. 10). By the end of this fiscal year, the installation
for the access to electricity also made some progress on
the substation site.

been working with untiring perseverance to improvethe USM yields to the level needed for practical applications. However, they seemed still in the midst of a longcrucial stretch throughout this year to gain enoughvacuum-ultraviolet (VUV) laser power for the Mu ionization. The promise of a crystal vendor to deliver ahigh-quality ceramic crystal for the final laser amplifier
has not been fulfilled yet, although we still hope thatthe vendor would manufacture a suitable crystal assoon as possible.

Struggle for ultra-slow muons continued
Since the successful generation of ultra-slow
muons (USMs) at MUSE in FY2015, experimenters had

Technology Development Section
1. Routine operation of the deuteration laboratory
A deuteration laboratory, which has been set up on
the first floor in the J-PARC research building, started
its routine operation in this fiscal year. The laboratory
consists of a biological deuteration room and a chemical deuteration room. Special wastewater treatment
equipment for draining from biological and chemical
deuteration rooms are belonging to the deuteration
room. There is also emergency power supply for twodays in full operation, which will be used in the caseof power failure in the biological deuteration room,
because the cultivation equipment usually operates forextended periods of time.
Firstly, we tested the individual equipment for
deuteration work and below themes successfully performed by the J-PARC staffs and their collaborators inthe biology deuteration laboratory.

1) Cultivation of green algae, which is the source of
medium components used in culturing Escherichia
coli (Photograph 1).
2) Cultivation of Escherichia coli (non-recombinant)using a deuterated medium.
3) Preparation of deuterated DNA samples.
Also, below themes successfully performed by the
J-PARC staffs and their collaborators in the chemical
deuteration laboratory.
1) Deuteration of ionic liquids and acrylic monomers(Photograph 2).
2) Chemical structure evaluation by LC-MS.
3) Preparation of deuterated polymer samples for neutron reflectivity measurement.
Statistics of the deuteration laboratory usage isshown in Table 1. It will be soon available for user.

J-PARC Annual Report 2018Materials and Life Science Experimental Facility

21

Photograph 1

Photograph 2

Table 1. Statistics of the deuteration laboratory usage.

Laboratory

Equipment

Days

Laboratory

Equipment

Days

17
12
13
232
7
1
2
9
1
2

Chemical
deuterationlaboratory

Lab bench
Vacuum oven
LC-MS

4
17
1

Biologicaldeuterationlaboratory

Lab bench
Fume hood
Ultrapure water equipment
ShakerClean bench
Evaporator
AutoclaveSpin coater
HPLC
FT-IR

2. Development of a high-durability chopper
The development of a high-durability T0 chopper
was completed this fiscal year (Fig. 11). We defined it asa second generation T0 chopper of which our operation
experience is reflected in the design. It has achieved astable operation at 100 Hz and is expected to function
maintenance free for 10 years. During the 2019 summer maintenance, this chopper will be installed at BL01,
which is Fermi-chopper type inelastic neutron-scattering instrument and uses up to epithermal neutron.
As for the second generation of the high-speed
disk chopper, we started a trial fabrication of a new
disk, which should achieve sufficiently high mechanical strength and reliability for a 350-Hz operation, andwill be made of laminated CFRP, mainly considerationof shape and adhesive of CFRP.

Fig. 11. High-durability T0 chopper

Particle and Nuclear Physics

Neutrino Experiment
T2K run in the fiscal year 2018 continued seamlessly from the 2017 runs in the anti-neutrino mode,and ended on May 31, and entered to a long shut down
for the water tank repair of the SuperKamiokande
detector. History of the accumulated protons on target(POT) and the beam power are plotted in Fig. 1. Stable
operation of 480-kW beam power was successfully
achieved. Since the beginning of the experiment, T2K
20
accumulated 16.5 × 10 POT in the anti-neutrino mode,20
in addition to so-far accumulated 15.1 × 10 POT in theneutrino mode.
In January 2019, T2K updated the neutrino oscillation results using all the data taken. With improved

Fig. 1. History of accumulated POT and beam power since
the beginning of T2K.

Particle and Nuclear Physics

J-PARC Annual Report 201824
study of neutrino-nucleus interaction with hybrid emulsion detector at the near detector hall, started detector
installation and commissioning and is planned to havea physics run in 2019.

∆m232 (NO), ∆m213 (IO) (eV2c-4)

statistics the tension between the neutrino and antineutrino remains with a two-sigma indication of the CP
violation. θ23 analysis result is still consistent to the maximal mixing as shown in Fig. 2. More statistics is eagerly
awaited for more conclusive results.
In order to improve the performance of on-site
neutrino detector ND280 and to increase the capability of the neutrino beam line to handle beam power
beyond 1 MW, extensive works are in progress. The
technical design report for each project was reviewed
by each dedicated ad hoc committee and by the J-PARC
Program Advisory Committee (PAC). The projects are
essentially ready to proceed.
Two new neutrino experiments were approved in
2018. The E56 experiment armed with a liquid scintillator detector, searches for sterile neutrinos comingfrom the MLF target and is planned to start taking data
in 2019. The E71 Ninja Experiment, aiming at precision

2.8

T2K Run 1-9 Preliminary

×10−3Best fit

2.7

Normal - 68CL
Normal - 90CL
Inverted - 68CL
Inverted - 90CL

2.6
2.5
2.4
2.3
2.2
0.3

0.35

0.4

0.45

0.5

sin2(θ23)

0.55

0.6

0.65

0.7

2

Fig. 2. Contours for νμ disappearance parameters sin θ232
2
2
andΔm 32 (or Δm 13) with reactor constraint on sin θ13.

Hadron Experimental Facility
The Hadron Experimental Facility (HEF) of J-PARC
is for fixed target particle and nuclear physics experiments with secondary hadron beams produced by theslowly extracted (SX) 30-GeV proton beam from theMain Ring (MR) accelerator. In FY2018, the SX beam
operation for users was conducted with a beam powerof 51 kW and a repetition cycle of 5.2 s in two periods;
from June 1 to 30 for 517 hours and from February 9
to March 18 for 581 hours. The 51 kW is the maximum
beam power allowed by the present hadron production target. The total integrated beam power delivered
during the FY2018 operation was 2321 kW∙ days, whichcorresponds to the operation for full five years with theold KEK 12-GeV Proton Synchrotron stopped in 2005.
Construction of a new primary beam line for thehigh-momentum (high-p) beam and COMET (a μ-e
conversion experiment) was in progress. A Lambertson
magnet to separate a fraction of the main proton beam
for the high-p beam has been installed in the switchyard tunnel together with other beam line elements(Fig. 3). In the Hadron Hall, a high-p beam line and anarea for the experiment for vector meson production in
Nuclei were being prepared.

A new hadron production target with gold was
fabricated (Fig. 4) and is ready to install in FY2019. It is
indirectly water-cooled from the both sides of the top
and bottom and can accept proton beams of about
90 kW.

Fig. 3. Photograph of the existing beam line (Aline) and a new beam line (B-line) in the
Switch-yard tunnel from MR to Hadron Hall.

J-PARC Annual Report 2018

Particle and Nuclear Physics

25

Fig. 4. A new production target for SX beam line under fabrication.

Strangeness/Hadron Physics Experiments
Several strangeness/hadron physics experiments
were conducted.
At the K1.8BR beam line, an experiment for X-ray
3/4
spectroscopy of He kaonic atoms (E62) took data in
June. It measures isotope-shift of 3d-2p X-rays using
an ultra-high resolution transition edge sensor (TES)
detector of ~5eV (FWHM) resolution to study whether
the kaon potential at the nuclei is deep or shallow.
Another pilot measurement (E57) of X-rays from akaonic hydrogen atom was in preparation for taking
data in April 2019. By a comparison between the kaonichydrogen and deuterium atoms, the experiment is aiming for disentangle the isospin 0 and 1 components of
the KN interaction.
At K1.8, the Σ hyperon-proton scattering experiment (E40), which gives a key data to understand theorigin of the repulsive core in nuclear force, started
data-taking in June. Data on Σ p scattering were taken+
by March and data on Σ p scattering will be taken in
FY2019.
Several results have been published in FY2018. A
simplest kaonic nucleus system, the K pp, was studied
by the E15 experiment. The group showed a possible
bound state in the system from the data taken in 2015
at K1.8BR.
A new double-Λ nucleus of a Be isotope wasobserved by the analysis of the emulsion experiment,
E07, which was carried out in 2016 and 2017 at K1.8.
The binding energy of the two Λ particles was determined for three possible scenarios that the nucleus is101112ΛΛ Be, ΛΛ Be, or ΛΛ Be.

Kaon Decay Experiment
The KOTO experiment is designed to study the
decay of a long-lived neutral kaon into a neutral π0meson (π ) and a pair of neutrinos. The detection ofthis decay is challenging, because only two photons
0from π are observable. The decay mode has not been
observed. This decay breaks the CP symmetry directly,
and the branching fraction is theoretically well pre−11
dicted in the SM as (3.0 ± 0.3) × 10 . By examining thisultra-rare decay, a new source of CP symmetry breaking
that can explain the matter–antimatter asymmetry in

the universe may be revealed.
In FY2018, KOTO continued the data acquisition
as well as conducted the upgrade of the calorimeterreadout. New results from the data collected in FY2015,
improving the world’s best sensitivity by an order ofmagnitude, were published. In parallel, the analysis of
the data collected in FY2016-2018 is ongoing intensively. These activities are described in details in the
Research Highlights of this report.

Particle and Nuclear Physics

J-PARC Annual Report 201826

Muon Experiments
The COMET, J-PARC E21 experiment, aims at searching for muon-to-electron conversion with a sensitivity−14of better than 10 in the first phase of the experiment.
Intensive R&D has been continued in 2018 toward the startof the experiment. The performance test of the cylindricaldrift chamber was successfully conducted using cosmicray muons. The construction of the Straw-tube tracker
and the mass production of lutetium yttrium ortho-silicate (LYSO) used for the electron calorimeter continued.
Construction of the Capture Solenoid (CS), used
to collect and transport pions/muons produced at the
COMET primary proton target, continued on schedule
together with preparation of the cryogenic system.

Design of the radiation shield to be inserted inside CS
for the purpose of protecting the super-conducting
wires from radiation progressed significantly.
The E34 collaboration prepares for precision measurements of muon anomalous magnetic moment
and its electric dipole moment. The revised technicaldesign report was submitted and the experiment wasapproved after reviews by the J-PARC PAC. The collaboration has carried out development of experimental
technology and components. A test experiment was
performed at the MLF D2 area for the measurement of
longitudinal distribution of a RF accelerated negative
muonium beam.

Highlight: First Major Result from KOTO: Breaking theWorld’s Best Sensitivity for a CP-Violating Rare Kaon
Decay by an Order of Magnitude
The matter–antimatter asymmetry in the universe is
one of the most mysterious puzzles in physics. The long
history of the studies on charge and parity (CP) symmetry breaking in the quark sector, which started from theobservation of the CP violation phenomena in neutral K
mesons (kaon) in 1964, had established in the Standard
Model (SM) how particles and antiparticles behave differently. However, it is known that CP violation in the
SM alone cannot explain quantitatively the situation of
the current universe, and other sources of CP violationmust exist. One of the best probes to search for such00
new mechanisms is K L → π νν, a CP-violating ultra-rarekaon decay. Its branching ratio is predicted precisely in−11
the SM to be (3.0 ± 0.3) × 10 , and deviation from theprediction is directly related to the existence of a newcontributor. Because of the extremely small branchingratio, the decay has not been observed.
KOTO (standing for “K0 at Tokai”) is a dedicated00experiment to search for the K L → π νν decay at the
Hadron Experimental Facility (HEF) of J-PARC. The international collaboration consists of 69 members fromJapan, Korea, Russia, Taiwan, and USA. KOTO took thefirst physics data in 2013 for 100 hours and achieved
a comparable sensitivity level to the world record [1].
KOTO resumed data taking in 2015 and continues
accumulating physics data since then. In 2018, KOTO

completed the analysis of the data recorded in 2015
and published the new result, as described in this article, which improved the world’s best sensitivity by anorder of magnitude [2].
00How to identify the K L → π νν decay signal? The
signal is characterized as an event that consists of two
0photons from the π decay in the final state and nothing else. Figure 5 shows a schematic view of the KOTO
detector in 2015. A 30-GeV proton beam, extracted
from the J-PARC Main Ring accelerator, hits a gold target
at HEF and produces secondary particles. Neutral kaons(and other long- lived neutral particles such as photons
and neutrons) are transported through beam collimators to the KOTO experimental apparatus, located 21 m
downstream of the target. The KOTO detector in a large
cylindrical vacuum tank surrounds the beam path andcaptures the daughter particles from kaon decays. An
electromagnetic calorimeter, which is an array of 2716
undoped cesium iodide (CsI) crystals (labeled CSI in
Fig. 5), measures the energies and positions of thephotons. Other components of the detector are vetocounters to detect any extra particles besides the two
photons if they exist.
A key for the rare decay search is to suppress andcontrol the background events that mimic the signal.
00
For example, a K L → 2π decay, whose branching ratio is

J-PARC Annual Report 2018

Particle and Nuclear Physics

27

Fig. 5. Cross-sectional view of the KOTO detector.

500
450
400

344
331.5±13.000.27±0.15

350
250
200
150
100
50

0
0.08

±0.05

1
1.23±0.41300

P t (MeV/c)

8 orders of magnitude larger than K 0L → π0νν, can be rec0
ognized as a single π event if two photons escape frombeing detected. It is essential to operate veto counterswith extremely high efficiency. A neutron hitting thecalorimeter and producing two photon-like activities
can also fake a signal. Development of photon and neutron discrimination using the calorimeter information isindispensable to reduce this type of background.
Figure 6 shows the scatter plot of the events in the0plane of the reconstructed π transverse momentum
0(Pt) and π decay vertex position (Zvtx) with all the event
selections imposed. The region inside the red polygon is the signal region. The black dots represent theobserved events, and the color contour indicates the00
expected distribution of the K L → π νν signal obtainedby the Monte Carlo simulation. The black and red numbers indicate the numbers of observed and expectedbackground events for each region surrounded by thelines, respectively. Consistency between these two
numbers demonstrates that the background events
are well understood. No candidate is observed inside
the signal region, and KOTO set the upper limit on the0−90
branching ratio of the K L → π νν decay as 3.0 × 10 at
90% confidence level. This improved the world’s best
sensitivity for the search by an order of magnitude.
0 0−90
KOTO also updated the limit for K L → π X as 2.4 × 10 ,02where X is an invisible boson with a mass of 135 MeV/c .
After the runs in 2015, KOTO conducted a major
detector upgrade in early 2016. An additional barrelshaped photon detector 3 m long in the beam direction
and 1.9 m in the outer diameter, was installed inside theexisting cylindrical photon veto counter. From 2016 to
2018, about 40% larger amount of data was collected
than that in 2015 with the new detector configuration,i.e. more than twice better sensitivity is expected withthe accumulated data in total. Intensive analysis of thedata is ongoing, and the new result will come in 2019.

including signal region00.42±0.18

1
0.55

±0.16

1
1.41±0.130001000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Zvtx (mm)Fig. 6. Two-dimensional plot summarizing the resultsfrom the analysis of the data recorded in 2015 [2].

Following the runs in the spring season of 2018,
KOTO performed a second major upgrade. To further suppress the neutron-induced background, theboth-end readout scheme has been devised andimplemented for the electromagnetic calorimeter. In
addition to the existing photomultiplier attached at therear end of each CsI crystal, thin photon sensors MPPCs(Multi-Pixel Photon Counter) have been newly installedat the front end. The idea is that the timing difference
between two readouts can provide the depth information of shower development in the calorimeter, which
is different in the electromagnetic case for photons
and hadronic case for neutrons. KOTO completed theupgrade and resumed data collection in February 2019.
References[1] J. K. Ahn et al. (KOTO collaboration), Prog. Theor. Exp. Phys.
2017, no. 2, 021C01 (2017).
[2] J. K. Ahn, et al. (KOTO collaboration), Phys. Rev. Lett. 122,
021802 (2019).

Cryogenics Section

Overview
The Cryogenics Section supports scientific activities
in applied superconductivity and cryogenic engineering, carried out at J-PARC. It also supplies cryogen of
liquid helium and liquid nitrogen. The support work
includes maintainance and operation of the superconducting magnet systems for the neutrino beamline, forthe muon beamline at the Materials and Life Science
Experimental Facility (MLF) and construction of themagnet systems at the Hadron Experimental Facility(HEF). It also actively conducts R&D works for future
projects at J-PARC.

Cryogenics Section

J-PARC Annual Report 201830

Cryogen Supply and Technical Support

40,0004000

35,0003500

30,0002500

25,0002000

20,0001500

15,000

1000
500

2500

40,00035,00030,00025,00020,0001500

15,00010,0001000

10,000

5,000

500

5,000
0

Fig. 1. Liquid helium supply at J-PARC from April 2018, to
March 2019.

Mar.

Feb.

2018Jan.

Nov.

Dec.

Oct.

Sep.

Jul.

Aug.

0

Mar.

Feb.

Dec.

2018Jan.

Oct.

Nov.

Sep.

Jul.

Aug.

May

Jun.

2017Apr

3000

45,0002000

0050,000
OthersRad. S
Cryo. S
MLF(neutron)
MLF(muon)
HEF
Cumul.

May

3000

4500

2017AprSupply (L)

3500

5000

45,000Jun.

4000

50,000

Supply (L)Cryo. S
MLF(neutron)
MLF(muon)
HEF
Cumul.

4500

Cumultive Supply (L)5000

their convenience. Its amount in FY2018 is summarized
in Fig. 2. Liquid nitrogen has been regularly provided
to the Radiation Safety Section for operation of a gas
chromatograph. It was also supplied to the users in the
MLF and the HEF.

Cumultive Supply (L)The Cryogenics Section provides liquid helium
cryogen for physics experiments at J-PARC. The usedhelium is recycled by the helium gas recovery facility at
the Cryogenics Section. Figure 1 summarizes the liquid
helium supply in FY2018.
Liquid nitrogen was also supplied to the users forFig. 2. Liquid nitrogen supply at J-PARC from April 2018, to
March 2019.

Superconducting Magnet System for T2K
The superconducting magnet system for theT2K experiment operated during the periods shownin Table 1. The system worked well without disturbing the beam time. The operation time was short andregular maintenances were carried out in the summer.
Figure 3 summarizes the incidents in the refrigeration
system from FY2009. The system was suspended onlyin its early period due to problems in the hardware andcontrol parameters. After FY2012, no refrigerator suspension occurred, except for accidental power outage.
Recently, the system has been very stable. Although a
few problems with hardware parts occur every year, thetroubles have been resolved without interrupting theoperation.

Table 1. Operation history of the T2K superconducting magnet system.

2018
Apr.
Operation
MaintenanceMay

2/28-6/1

June

Jul.

Aug.

Sep.

Oct.

Nov.

Dec.

2019
Jan.

Feb.

Mar.

3/13-3/29

J-PARC Annual Report 2018

Cryogenics Section

31

14

Number of Incidents

12
10Parts Trouble

8

Quench Miss Trigger

6

Control Parameter Mistuning
Magnet Quench by Beam

4

Electric Power Outage

2

Refrigerator Suspention

0

Fig. 3. Summary of incidents in the Refrigerator System for T2K.

Superconducting Magnet Systems at the MLF
The Cryogenic Section contributes to the operationand maintenance of the superconducting magnet systems at the Muon Science Facility (MUSE) in the MLF.
The superconducting solenoid in the Decay Muon
Line (D-line) was operated from January to the end ofJune 2018. After the annual maintenance in the summer shutdown from July to September, it was restarted
on October 15. It was stopped on December 21 for
the New Year holidays and resumed on January 15. No

serious problem was found in the cryogenic system for
D-line magnets in FY2018. In July and September 2018,
two superconducting solenoid magnets were cooled
down and tested. It took about two weeks for bothmagnets to cool down to 4 K, and they were successfully ramped up to a current of 187 A, corresponding
to 105% of the nominal current of 178.5 A. These magnets will be installed in the High Momentum Muon Line
(H-line) soon.

Superconducting Magnet Systems at the HEF
The COMET experiment is under construction in the
Hadron South Experimental Hall (HDS) of the Hadron
Experimental Facility (HEF). The Cryogenics Section
was involved in the construction of the cryogenic system and superconducting magnets. Production of thesuperconducting solenoid magnet using radiationresistant materials is in progress for the muon source.
The detailed design of the cryostat of the Pion Capture
Solenoid was improved.
The magnets are designed to be cooled by a twophase flow of liquid helium which is supplied by ahelium refrigeration system built in HDS. The cooling
capacity of the helium refrigerator has been measured
to be 140 W at 4.5 K in the case of 500 W heat load onshield gas. Currently, a lead system which includes
helium distribution is under development.
The transfer line from the current lead system tothe Muon Transport Solenoid (MTS) was fabricated andinstalled in the HDS in FY2018. It has four cooling pipes
and four bundles of superconducting wires which arecooled down by thermal conduction from a 4-K pipe.
Before the fabrication, we performed cooldown tests
with a short cut model of the transfer line to optimize
the thermal contacts to bundles of superconducting
wires. It was found that each bundle of 3 wires had tobe surrounded by a thin Indium sheet and the thermal
anchor blocks needed additional pure aluminum atthe contacts to cool down properly all superconducting wires. It was clarified from the tests that all 12 wires
reached a temperature less than 4.6 K. Figure 4 showsa thermal anchor blocks for 4 bundles fabricated in thefactory. At the end of the installation, the superconducting wires were soldered with the lead wires to theprotection diodes of the MTS, as shown in Fig. 5.

Cryogenics Section

J-PARC Annual Report 201832

Fig. 5. Soldered splices at the interface to the protection diodes of the Muon Transport Solenoid.
Fig. 4. Thermal anchor block with 12 superconducting wires
in the transfer line.

R&D for the Future Projects at J-PARC
The g-2/EDM project aims for the precise measurement of the anomalous magnetic moment and theelectric dipole moment of muons. This experiment was
proposed at the MUSE H-Line. A superconducting solenoid with a high field homogeneity, better than 1 ppm
locally, plays a very important role as a muon storage
ring. In 2018, the design study focused on the kicker
coil. The shielding effect of transient field of the kicker
coil due to SUS chamber was calculated in detail andthe chamber size was increased to reduce the shielding
effect.
A muonium hyperfine structure measurement,
called MuSEUM experiment, has been proposed for thesame beam line as the g-2/EDM project. In the experiment, the energy state transition in muonium will beobserved under a static magnetic field with local homogeneity of 1 ppm. A standard NMR probe to determine
the absolute magnetic field is being developed tocalibrate other probes. Cross calibration tests in the collaborative framework between the USA and Japan havebeen in progress since 2017. The comparison between

the US probe and the newly developed KEK probe wascarried out at the Argonne National Laboratory (ANL) in
January and February 2019, as shown in Fig. 6. The data
analysis is in progress, and the discussion will take placein J-PARC in September 2019.

Fig. 6. Cross calibration test between KEK and US probes in
the MRI magnet at the ANL.

HTS Maglev Coaster for Demonstration
Cryogenics Section conducted constructing superconducting magnetic levitation coasters for public
relations and for educational lessons to demonstratecryogenics with the ReBCO high-temperature superconductor. For easy treatment and safety, a long trackrail made of rubber magnet ribbon has been utilized
recently, instead of Neodymium magnets. The lightweight superconducting coaster is fabricated with a
ReBCO tape coated conductor to achieve enough levitation and pinning on the weak magnet track.

Information System

Overview
The Information System Section plans, designs,
manages and operates the network infrastructure of
J-PARC and also provides support to ensure its information security. In terms of computing, until now, J-PARC
has owed its major computer resource for analyzing

and storing data from neutrinos, nuclear physics and
MLF experiments to the KEK central computer system.
The section connects the J-PARC network to the KEK
central computing system directory and helps the users
to utilize the system effectively.

Status of Networking
Since 2002, the J-PARC network infrastructure,
called JLAN, has been operated independently fromKEK LAN and JAEA LAN in terms of logical structure andoperational policy. In 2018, the total number of hosts(servers and PCs) on JLAN exceeded 5,000 and the number has increased by 106% from the last year. The growth
curve of edge switches, wireless LAN access points andhosts connected to JLAN are shown in Figure 1.

Information System

J-PARC Annual Report 2018

34

350
300
250
200
150
100
50
0

additional activity. Figures 4 and 5 show the statistics
of data transfer between the Tokai site and the Tsukubasite. The network bandwidth capacity between the twosites is 10 Gbps. This shows the usage level has been
approaching a half of it, especially during the period
when the Hadron facility was running. In addition to thecurrent bandwidth, the upgrade offers a future optionof 20 Gbps for both of internet and Tokai-Tsukuba connections, if J-PARC network can be adapted.

Edge Switches
WLAN Access Points
No. of hosts

6000
5000
4000
3000
2000
1000
0

Fig. 1. Number of hosts, edge SW and wireless AP on JLAN

Fig. 2. Network traffic from JLAN to the internet(1 hour average and 5 minutes peak value).

Fig. 3. Network traffic from the internet to JLAN

No. of Hosts connected to
JLAN

SW and WLAN AP

In April 2016, the National Institute of Informatics(NII) upgraded SINET (Japan Science Information
Network https://www.sinet.ad.jp) from version 4 to 5.
SINET is not only a gateway from JLAN to the internet
but also an important connection between Tokai and
KEK Tsukuba site in J-PARC.
Figures 2 and 3 show the network utilization of theinternet from/to JLAN. Since the bandwidth capacity
for the internet through the SINET is 10 Gigabits per
second (Gbps), it is clear that there is enough space forJ-PARC Annual Report 2018

Information System

35

Fig. 4. Network traffic from Tsukuba site to Tokai site.

Fig. 5. Network traffic from Tokai site to Tsukuba site.

Fig. 6. Peak network traffic for recent years.

Internet Connection Services for Visitors andPublic Users of J-PARC
Since 2009, J-PARC has offered a Guest network(GWLAN) service, which is a wireless internet connection service for short-term visitors, available in almost
all J-PARC buildings. In the end of 2014, additional
network service called User LAN has started. In using
the GWLAN, users are required to receive a password
at the J-PARC Users Office beforehand, while in theUser LAN users are authenticated by the same ID andpassword for the User Support System, which is also
used for dormitory reservation or so on. From March
2016, a new service called “eduroam” has been started.

The eduroam (https://www.eduroam.org/) is a secureroaming access service developed for the international
research and education community and mutually usedamong a huge number of research institutes, universities and other institutions around the world. The
eduroam service will be a convenient third option ofinternet connection service for J-PARC visitors. Figure 7
shows this FY usage statistics of GWLAN, User LAN andthe newly introduced eduroam service.

Information System

J-PARC Annual Report 201836

Fig. 7. Usage trends of GWLAN, User LAN and eduroam.

Status of Computing
J-PARC does not have computing resources forphysics analysis, so since 2009, the KEK central computing system (KEKCC) at the KEK Tsukuba campus
has been mainly used. At the Neutrino (T2K), Hadronand Neutron (MLF) experiments, the data taken in
J-PARC are temporarily saved at their facilities and thenpromptly transferred, stored and analyzed at the system in Tsukuba. The storage of the system is also be
utilized as a permanent data archive for their data.

The second upgrade of the system was completed
in 2016, and the computing resources assigned to
J-PARC are shown in Table 1. Figures 8-10 show the utilization statistics of the computing resources in 2018.
The main users who used the CPU and storage constantly were from the Hadron experiment (KOTO) and
Neutrino groups. The MLF group also started to store
data to tapes on the system.

%

Table 1. Assigned computing resources to J-PARC activities in the KEKCC

100
80
60
40
20
0

CPU (Intel Xeon E5-2697v3)

4700 cores

RAID Disk (GPFS)

4.5 Peta Bytes

Tape (HSM)

27 Peta Bytes

CPU Utilization

HadronNeutrino

MLF

Fig. 8. CPU usage statistics (the yellow line shows resource assignment for J-PARC)

J-PARC Annual Report 2018

Information System

37

Disk annual
annual utilization
utilization
Disk annual utilization
Disk annual utilization

PBytes
PBytes
PBytes
PBytesDec-18Dec-18Oct-18Oct-18

Feb-19Feb-19Feb-19Feb-19Mar-19Mar-19Mar-19Mar-19Dec-18Dec-18Jan-19Jan-19Jan-19Jan-19Oct-18Oct-18
Nov-18
Nov-18
Nov-18
Nov-18

Tape utilization in 2018
Tape utilization in 2018
Tape
Tapeutilization
utilizationin
in20182018

HadronNeutrino

MLF

HadronHadronHadronNeutrino
Neutrino
Neutrino

MLF
MLF
MLF

PBytes
PBytes
PBytes
PBytes

7
6
75
64
53
42
31
20
1
0

3.0
3.0
3.0
2.5
2.5
3.0
2.5
2.0
2.0
2.5
2.0
1.5
1.5
2.0
1.5
1.0
1.0
1.5
1.0
0.5
0.5
1.0
0.5
0.0
0.0
0.5
0.0
0.0

2011 20122012 20132011
2013 20142014 2015
20152016
20162017
20172018
20182011 2012 2013 2014 2015 2016 2017 2018
Neutrino
MLF
HadronNeutrino
MLF
2011 2012 2013 2014 2015 2016 2017 2018
Neutrino
MLF
HadronNeutrino
MLF
Neutrino
MLF
HadronNeutrino
MLF
Neutrino
MLF
HadronNeutrino
MLF
Fig. 9. Disk usage statistics (Left: trend of this FY year; Right: annual trend)

Apr-18Apr-18Apr-18Apr-18May-18May-18May-18May-18Jun-18Jun-18Jun-18Jun-18
Jul-18
Jul-18
Jul-18
Jul-18Aug-18Aug-18Aug-18Aug-18
Sep-18
Sep-18
Sep-18
Sep-18Oct-18Oct-18Oct-18Oct-18
Nov-18
Nov-18
Nov-18
Nov-18Dec-18Dec-18Dec-18Dec-18Jan-19Jan-19Jan-19Jan-19Feb-19Feb-19Feb-19Feb-19Mar-19Mar-19Mar-19Mar-19PBytes
PBytes
PBytes
PBytes

7
67
56
45
34
23
12
01
0

Aug-18Aug-18

HadronHadronHadronHadronAug-18Aug-18
Sep-18
Sep-18
Sep-18
Sep-18Jun-18Apr-18Apr-18Apr-18Apr-18May-18May-18May-18May-18Jun-18

PBytes
PBytes
PBytes
PBytes

2.53.02.0
2.0
2.02.51.5
1.5
1.52.0
1.0
1.0
1.5
1.0
0.5 0.5
0.0
0.51.00.0
0.00.50.0

Jun-18Jun-18
Jul-18
Jul-18
Jul-18
Jul-18Diskutillization
Disk
utillizationininFY2018
FY2018Diskutillizationin
FY20183.0 3.0
3.0 2.5 Disk utillization in FY2018
2.5

7
76
6775
564
453
342
231
120
011
00

Tape annual utilizaion
Tape annual utilizaion
Tape annual
annualutilizaion
utilizaion
Tape

2011 2012 2013 2014 2015 2016 2017 20182011 2012 2013 2014 2015 2016 2017 2018
2011
2012
2015
2018
2011 Hadron2012 20132013 2014201420152016
20162017
2017
2018
Neutrino
MLF

HadronHadronHadronNeutrino
Neutrino

Neutrino

Fig. 10. Tape library usage statistics (Left: trend of this FY year; Right: annual trend)

MLF
MLF

MLF

Transmutation Studies

Overview
We have been working on R&D for developing
nuclear transmutation technology with acceleratordriven systems (ADS) using the J-PARC’s researchresources and expertise on high-power accelerator andtarget technologies. The ADS is an effective nuclear
system for volume reduction and mitigation of harmfulness of high-level radioactive waste.
Nearly 20 years ago, we proposed the concept ofan experimental facility, Transmutation Experimental
Facility (TEF), for development of ADS. TEF consists of
two individual facilities; the ADS Target Test Facility (TEFT) for irradiation of beam window materials, which is
required for development of high-power lead-bismuth
eutectic (LBE) targets, and the Transmutation Physics

Experimental Facility (TEF-P) for reactor physics study
for proton beam driven subcritical cores with bearing
minor actinide fuels. A technical design report for TEF-T(JAEA-Technology 2017-003, 539 pages) and a safety
design report for TEF-P (JAEA-Technology 2017-033,
383 pages) have been published. In 2018, the design
report for TEF-T was further reinforced and translated
into English. Owing to these efforts, we believe that thebasic design of TEF-T and TEF-P has been completed.
In 2018, we have started reorienting the conceptof the experimental facility to make it more attractive
and effective by introducing leading edge knowledge
to its purpose and specifications. The main purpose of
the new facility is the same as TEF-T, that is, irradiation

Transmutation Studies

J-PARC Annual Report 201840
of beam window materials of ADS by impinging theproton beam to the LBE target. In addition, since there
is a strong demand to irradiate beam window and target materials at J-PARC’s existing experimental facilities,
the new facility is equipped with a space in front of the
LBE target to irradiate various sample materials by the
proton beam. Thus, the new facility is a proton irradiation facility.
The idea of TEF-T is to irradiate sample materials
at TEF-T, and once they are irradiated, the materials
are transported to JAEA’s hot-labo facilities for postirradiation examination (PIE). However, this method isinefficient because of the problems with transportationof radioactive materials, and the JAEA’s hot-labo facilities are rather old. Hence, the new facility is furnishedwith a hot-labo. The hot-labo can be used for PIE for
irradiated materials in both the new facility and theexisting J-PARC’s experimental facilities. Accordingly,
the new facility can contribute not only to the development of ADS but also to upgrading the J-PARC’s existing
facilities.
We have continued our R&D activities to support
the design of the experimental facility and ADS. We aredeveloping the LBE target technologies on the topics ofthermal-hydraulics, materials corrosion, instrumentation including oxygen concentration control, acquiring
operation experience by mainly using two large LBE
circulation loops, etc. We are continuing the measurement of nuclide production and displacement crosssections, and the development of proton beam monitors, which can withstand a high-power proton beam.
We are also continuing reactor physics experiments byusing critical assemblies. Details of these R&D activities
are described in this chapter. In 2018, we launched an
R&D activity to develop superconducting linac for ADS
with the full cooperation of J-PARC’s accelerator team.
On February 14 and 15, 2019, the fourth TEF
Technical Advisory Committee (T-TAC), which was oneof the technical advisory committees under the J-PARC
International Advisory Committee, was held (Fig. 1). The
T-TAC encouraged our efforts for the reorientation of the
facility as “The proposed approach builds on J-PARC’sstrong expertise in the field of accelerator and target
technologies and addresses a scope that encompasses
not only the ADS mission but also other high-power
accelerator applications. T-TAC finds that the proposed
applications are sound and technically feasible.”Fig. 1. T-TAC members and attendees.

J-PARC Annual Report 2018

Transmutation Studies

41

Research and development
Studies for proton irradiation facility
The experimental studies to establish the proton
irradiation facility for ADS development have been
progressing. In the LBE loop experiment, the operation for steady state and transient experiments has
been performed by using IMMORTAL (Integrated Multifunctional MOckup for TEF-T Real-scale TArget loop).
Regarding the target materials, conditioning operationand functional tests of OLLOCHI (Oxygen-controlled
LBE LOop Corrosion tests in HIgh-temperature) started.
In the area of instrument developments, the manufacturing of oxygen sensors and the development ofa freeze-seal type valve (FV) are progressing as a key
instrumentation technology for the LBE loop system.
Development of remote handling technology for target maintenance has been advancing. The results aredescribed in detail below.
IMMORTAL
To acquire verification and validation (V&V) data forthe safety analysis code, we performed steady state andtransient experiments by using IMMORTAL.

Fig. 2. Exterior of IMMORTAL.

A simulation test for accidental beam over power
condition under a constant flowrate operation was performed. To simulate the beam over power condition,
the output of the Main Heater (MH) was changed in therange from the initial state (100%, 57 kW) to 118% at
the maximum. The flowrate of the primary (LBE) systemand the secondary (pressurized water) system were 46
liter/min and 60 liter/min, respectively. As a result, it was
confirmed that the temperature of each system rose
up simultaneously. There was no significant change inthe temperature difference compared with the initialconditions. Further, the heat transfer performance of a
primary heat exchanger (HX) was preliminarily verified
by the results of several non-isothermal operation tests.
However, since the verification was based on a limited
amount of experimental data, we will continue theexperiments to accumulate more experimental data
contributing to the verification and validation of thesafety analysis code.
OLLOCHI
Before the corrosion test in OLLOCHI, the conditioning operation and the functional tests of thecomponents were carried out. The electro-magnetic
flowmeters (EMFs) were calibrated at 400˚C. As afunctional test for the main heaters and the cooler, nonisothermal operations were performed at 450˚C withtemperature difference of 100˚C. From the results, we
obtained the correlation between the inlet valve lift of
the air cooler and the temperature difference.

Fig. 3. Outline of OLLOCHI.

The dissolved oxygen concentration (OC) control
tests started in January 2019. We managed to maintainmanually the oxygen concentration within a certain
range by mixing of the inlet gases. The control tests will
be continued to obtain loop-specific parameters necessary for the automatic control of OC.
Oxygen concentration (OC) control tests
In order to control OC in LBE automatically, oxidizing gas or reducing gas is temporarily added tothe cover gas phase when the oxygen sensor output

Transmutation Studies

J-PARC Annual Report 201842
crosses the setting thresholds. As a result of demonstration experiment, OC was kept at a target value (0.98 V)
constant under stagnant LBE condition using an oxygen sensor calibration system (Fig.4). By applying thesame control scheme to the LBE loops, we will start an
automatic control test under the LBE flow condition in
FY2019.

Fig. 4. Oxygen sensor calibration system under stagnant LBE
condition

Freeze-seal valve development
Freeze-seal valve (FV) is under development to
add passive safety function to the LBE spallation target
loop. By applying FV to the LBE loop, we can minimize
the slow leak of LBE due to (1) sticking small chemicalcompounds into the seal of the mechanical valve, (2)accidents, such as station blackouts. LBE in FV melts by
their own latent heat and LBE will be drained out automatically. However, LBE shows re-crystallization withvolumetric expansion after solidification and that will
generate stress in the FV. To mitigate the generated
stress inside the FV piping, the hoop and axial stressfor the stainless-steel container with LBE was measured
by using apparatuses shown in Fig. 5. As a result, it was
found that annealing at 50-80˚C was the most effective
to reduce the stress. Cooling rate dependence was not

Fig. 5. Apparatuses for strain measurement.

observed in the stress. The stresses were lower than theallowable stress of SS304.
Remote handling technology
Throughout the annual operation, the target vessel
will be damaged from the bombardment by the pulsed
proton beam and will be highly activated. It is essential,
therefore, to develop remote exchanging technology
for the target vessel. We have been evaluating theapplicability of target exchange technology by remote
cutting / welding of the loop piping. A prototypicalremote jig to assist works has been improved. The operability of the revised jig was improved by adding newconcepts, such as a simultaneous mounting structureof a commercial pipe cutter and a welding machine.
Further, we adopted radiation testing as a candidate
inspection method after welding. We will perform demonstration tests to establish a series of remote works
for the exchanging of the target vessel by using these
improved jigs shown in Fig. 6.

Fig. 6. Improved remote jig (left side) and a mockup of remote RT machine (right side).

Displacement cross section measurement
As an index of radiation damage of materials, displacement per atom (DPA) is widely used in many fields,such as fission and fusion reactors, and accelerator
facilities. The DPA can be estimated by integrating aparticle flux by the displacement cross section. Since
the experimental displacement cross section data were
scarce for protons with energy higher than 20 MeV, theexperiment was conducted in J-PARC. The displacement cross section could be delivered from an electric
resistivity increase of a sample by proton irradiation.
To prevent the defect from recovering by the thermal
motion of atoms, the sample was cooled to about 4 K byusing a cryocooler. In Fig. 7, the present result of the displacement cross section of copper for 3-GeV proton iscompared with the experimental data carried out in the

J-PARC Annual Report 2018

Transmutation Studies

43
lower energy region and the calculation. The present
data showed overestimation of about 4 times the calculation with Norgertt-Robinson-Torrens (NRT) model,
which is widely utilized to obtain the displacement
cross section. It was also shown that the PHITS with
the improved model with athermal recombination correction model based on Nordlund parameter showedremarkably good agreement with the experimental
data. By accumulation of experimental data in future
work, the accuracy of the radiation damage calculation
is expected to be improved.

High-energy proton

Target nucleus
protonneutronSpallation reaction(1) Intranuclear cascade process

Secondary particle

Highly excited state(2) Deexcitation process

Particle emission

Particle emission

FissionFissionFig. 8. Schematic of the spallation reaction

Fig. 7. Displacement cross section obtained with the experiment at J-PARC compared with a previous experimentand the calculations.

Improvement of the spallation model
The particle transport simulation plays an important role in the neutronic and shielding design ofhigh-energy accelerator facilities and acceleratordriven nuclear transmutation systems. In the particle
transport simulation at energies above several tens ofmega-electron volts, a nuclear reaction model provides
information about secondary particles and the spallation products produced from the spallation reactions.
As illustrated in Fig. 8, the spallation reaction isdivided into two processes according to their dynamical
time scales and mechanisms: the intranuclear cascade
process and deexcitation process. In the first process,protons and neutrons that consist of a nucleus repeatedly collide with one another and emit from the target
nucleus. Because the residual nucleus just after the firstprocess is in highly excited state, it becomes stable inthe subsequent process by emitting energetic particles.
For heavy targets such as lead and mercury, a nuclear
fission may occur competing with the particle emission.

In our study, to improve the predictive capabilityof spallation product yields, particularly produced fromthe nuclear fission, a description of the fission probability in the spallation model was proposed [1]. Figure 9
208
209
181
shows the fission cross-sections of Pb, Bi, and Ta
calculated with the conventional and our proposedmodels. Comparing with experimental data for heavy
nuclei showed that our proposed model can provide a
unified prediction of the proton- and neutron-induced
fission cross sections with markedly improved accuracy.
In future work, the proposed model is expected to be

Fig. 9. Proton-induced (left panel) and neutron-induced (rightpanel) fission cross sections compared with the calculations and experimental values.

Transmutation Studies

J-PARC Annual Report 2018

44
utilized in designing the accelerator-driven system fornuclear transmutation and its experimental facility at
J-PARC.
MA transmutation experiments
ADS feasibility studies have been conducted atseveral experimental facilities of reactor physics, including the MASRUCA reactor (France), the YALINA booster(Belarus), the VENUS-F facility (Belgium), and the
KUCA at Kyoto University (Japan). The Transmutation
Experimental Facility (TEF) and the Multi-purpose
hYbrid Research Reactor for High-tech Applications(MYRRHA) have been planned to construct functional
experimental facilities for implementation of nuclear
transmutation of MA by ADS. ADS incorporates an innovative system of safety whereby a reactor is operated
at a subcritical state, with the combined use of a highenergy proton accelerator and a fast spectrum reactor
core. Subcritical irradiation of MA by ADS with a criticalassembly even at zero power is a very important step,
before operating actual ADS facilities.
Using the KUCA facility, as shown in Fig. 10, thefirst significant attempt was made to demonstrate
the principle of nuclear transmutation of MA by ADS
through the injection of high-energy neutrons into
the uranium fueled core at a subcritical state. The main

objective of this experiments is to confirm fission reac237
tions of neptunium-237 ( Np) and americium-241
241
237( Am), and capture reactions of Np. Subcritical irra237
241
diation of Np and Am foils is conducted in a hard
spectrum core with the use of the back-to-back fission
chamber that obtains simultaneously two signals from237
241
specially installed test ( Np or Am) and reference(uranium-235) foils. Figure 11 shows an example ofexperimental results: the pulsed heights as the horizontal axis correspond to the kinetic energy of fission
237
235
fragments in Np and U fission events.
237
241
The first nuclear transmutation of Np and Am
by ADS soundly implemented by combining the subcritical core and the 100 MeV proton accelerator, andthe use of a lead-bismuth target, is conclusively demonstrated through the experimental results of fission andcapture reaction events [2].

Fig. 11. An example of experimental results (Pulsed heights
237
235
of Np and U fission reaction rates at subcriticalstate) [2].

References[1] H. Iwamoto and S. Meigo, Journal of Nucl. Sci. and Technol. 56,
160-171 (2019).

Fig. 10. Photograph of the solid moderated core of the KUCA
facility.

[2] CH. Pyeon et al., Journal of Nucl. Sci. and Technol. 56, 684-689(2019).

SafetySafety

J-PARC Annual Report 201846

Safety1. Major events on safety culture and safety activities at the J-PARC Center
The major events on safety culture and safety activities at the J-PARC Center are listed in Table 1.
Every year since 2014, the J-PARC Center holds
workshop 5.23 for fostering safety culture to keep freshthe lessons of the radioactive material leak incident
at the Hadron Experimental Facility on May 23, 2013.
A “Safety Day” was launched last year, which, in addition to workshop 5.23, also includes a discussion of thesafety culture. The safety day took place on May 25.
In the morning, we held a meeting between the sections to exchange information on the safety efforts.
The number of participants was 106. The director of
the J-PARC Center gave away three “Safety Awards
for good examples”. The hadron section received one
because they reported more good examples of safety intheir daily works than the other sections. The other two
were given to the neutron science section/technology
development section/CROSS and accelerator section 1,
because they reported excellent good examples.
Dr. Yoshimi Kasugai from the radiation safety section gave a scientific talk with the title “Where will thetritium generated in mercury via the spallation reaction
be transferred?”. Dr. Hiroshi Takada from the neutron
source section introduced the safety work of the MLF
facility under the title “Example of tritium emission control at the time of mercury target container exchange
work”. Also, Dr. Yoshinori Kurimoto from accelerator
section 5 introduced the safety work of the accelerator
facility under the title “Safety measures for the capacitor
bank for main electromagnet power at the main ring –fuse wire melting trial and operation”.
In the afternoon part of the Safety Day, workshop
5.23 for fostering safety culture was held at the auditorium of the Nuclear Science Research Institute with
284 attendees. Mr. Haruyasu Hoshino, project managerof the safety and health promotion division of Toyota
Motor Corporation was invited this year; he spoke
about a safety response and safety culture construction
at the time of automation of work at Toyota.
The emergency drill was carried out on September
6. It was assumed that a big fire occurred in the Linac
accelerator tunnel during a summer shutdown. The
main purpose of the drill this year was to practice theresponse when an early attempt to extinguish the fire
has failed.
The J-PARC Safety Audit in FY2018 was conducted

Fig. 1. Emergency drillby two external auditors (Prof. Akira Tose from Niigata
University and Dr. Katsumi Hayashi from the Institutionof Professional Engineers) on November 20-21. They
reviewed mainly five points: safety control of work,
introduction of “the business improvement pertaining
to prevention of radiation hazards”, effectiveness andreview of the radiation safety education, notification ofabnormal and emergency, activities for fostering safety
culture. They suggested to put “stop oneself” in the ideaof “stop work”. They also pointed out that a culture tothink and operate by ourselves was important.
2. Radiological license update and facility inspection
Applications to update the radiological license
were submitted to the Nuclear Regulation Authority on
July 9 and November 21. The major application items
are listed in Table 2. The permits for the applications
were issued on August 22 and on February 4, 2018,
respectively. There were no cases requiring a facility
inspection in FY2018.
3. Meeting of the committee on the radiation safety
matter
The basic policies on radiation safety in the J-PARC
are supposed to be discussed by the J-PARC Radiation
Safety Committee (RSC). Meanwhile, the J-PARC
Radiation Safety Review Committee (RSRC) is expected
to discuss specific subjects of radiation safety in the
J-PARC. The RSC meetings were held twice and those of
the RSRC, three times. The major issues are summarizedin Table 3.
4. Radiation exposure of radiation workers
In FY2018, 3342 persons were registered as

J-PARC Annual Report 2018

Safety47
radiation workers. In these five years the number ofworkers fluctuated between 3000 and 3500, except for
FY2014 when many contractors took part in the construction work of the hadron south experimental-hall,located in the radiation-controlled area of the Hadron
Experimental facility.
The distribution of annual exposed doses issummarized in Table 4 for each category of workers: inhouse staff, users and contractors. The exposed dosesof gamma-rays and of neutrons were measured with an

optically stimulated luminescence (OSL) dosimeter andwith a plastic solid-state track detector, respectively.
All users and almost in-house staff and contractors
were exposed less than detection limit (Not Detected,
expressed as “ND” in the table). The maximum exposed
dose was 0.9 mSv. Though it was less than the administrative dose limit at the J-PARC (7 mSv/year), we should
continue to make an effort to reduce the exposed dosesof all workers.

Table 1. List of major events on safety in FY2018

Year

2018

2019

Date

EventsMay 25

Safety Day (Meeting to exchange safety information between all
sections, Workshop for fostering safety culture)

July 29

Liaison committee on safety and health for contractors

Sep. 27, Oct. 3, 31 Nov. 2, 29

Refresher course on radiation safety for in-house staff

Sep. 6Emergency drill assuming a big fire in the Linac accelerator tunnel
during a summer shutdown.

Nov. 20 - 21

FY2018 J-PARC Safety Audit

Jan. 24 - 25

6th Symposium on Safety in Accelerator Facilities

Table 2. Major application items of the radiological license

Facility
RCS

Items of an application• Addition of samples for the proton beam irradiation experiment• Change of material of the radiation shielding in the M2 beam line

MLF

• Addition of description concerning maintenance work in the U-line• Addition of sealed radioisotopes• Reduction of a storage facility for induced radioactive materials

HD• Beam intensity: 4.0 × 1016 → 4.3 × 1016 protons/hour• Addition of disposal method of radioactive liquid waste in the second utility building

NU• Change in the concentration assessment in the exhaust of radioactive gaseous waste generated
inside a helium vesselAll• Optimization of the application document

Safety

J-PARC Annual Report 201848
Table 3. Radiation Safety Committee (RSC) and Radiation Safety Review Committee (RSRC) in FY2018

No.

Date

Major Issues

The Radiation Safety Committee

30th

32

th

28 May 2018

2 Oct. 2018nd

27 Dec. 2018rd

28 Mar. 201933

• Policy on the revision of organizational structure for radiation safety
management

nd

st

31

• Report of radiation exposure status in FY2017• Policy on the radiological license update for the MLF, the HD and the
Neutrino facilities• Report of deliberation status of revision proposal of the Local Radiation
Protection Rule for J-PARC• Report about the RSC• Report of revision of the Local Radiation Protection Rule for J-PARC

th• Deliberation about the role of the RSC• Policy on the radiological license update in FY2019• Report about the deliberation in RSRCth

The Radiation Safety Review Committeeth

11 May 201820th

3 Jul. 2018

st21

• Revision of the radiological license update for the RCS and the MLF facilities• Report of a hearing by the secretariat of the Nuclear Regulation Authority about a revision proposal of the Local Radiation Protection Rule for
J-PARCth

10 Sep. 2018

• Revision of the Local Radiation Protection Rule for J-PARC• Revision of the Detailed Rule of Local Radiation Protection Rule for J-PARC• Revision of the Transportation Rule for Radioactive Materials in J-PARC
Site

th

17 Dec. 2018rd

20 Mar. 201923

• Report of radiation exposure status in FY2017• Revision proposal of the Local Radiation Protection Rule for J-PARC

rd

nd

22

• Update of the radiological license for the MLF, the HD and the Neutrino
facilitiesth19• Update of the radiological license for the Linac, the RCS, the MR and the
MLF facilities• Use of the X-ray generator at the JRB and the MLF facilitiesth

Table 4. Annual exposed doses in FY2018

Dose range x (mSv)# ofworkersND

0.1≤ x ≤1.0

1.0< x ≤5.0

5.0< x

Collective dose
(person mSv)

Maximum dose(mSv)

In-house staff

696

661

35

0

0

11.5

0.9

Users

1,296

1,296

0

0

0

0

0

Contractors

1,365

1,303

62

0

0

16.2

0.9

Total

3,342

3,245

97

0

0

27.7

0.9

User Service

User Service

J-PARC Annual Report 201850

Users Office (UO)
Outline
The J-PARC Users Office (UO) was established in2007. It opened an office on the first floor of the IBARAKI Quantum Beam Research Center in Tokai-mura, in
December 2008. UO maintains the Tokai Dormitory for
the J-PARC users. UO provides on-site and WEB support
with one-stop service for the utilization of the J-PARC.
As of March 31, 2018, UO had 14 staffs and 4 WEB Support SE staffs in the Users Affairs Section. The J-PARC
Users, after the approval of their experiment, follow
the administrative procedures outlined on the Users
Office (UO) WEB Portal Site, related to the registration
as a J-PARC User, radiation worker registration, safety
education, accommodation, invitation letter for visa
and other requirements. Then, the UO staffs provide
them with support by e-mail. After their arrival in the
J-PARC, UO gives on-site assistance to the J-PARC Users, like receiving the J-PARC ID, glass badge, and safety
education. Since 2015, UO had been doing its part toimprove the J-PARC on-line experiment system andmake it more user-friendly.

1 Hitachi
Minami-ohta

TNiken-jaya
intersection

TOKAI
Smart ICJ PA
ATokai Village
OfficeJAEA Main Gate
(Central Security Office)[J-PARC]

Cocos
restaurant
62

PC depostore

Kakeagariintersection

Post Office

JR Tokai
StationTokai Hospital

Mobile phone
shop

Muramatsu
ShrineFire Station

Joban
Expressway

Magome-jujiro
intersection
349

Kasamatsu
Park

Ibaraki Higashi
National Hospital
245

Macdonald
Humbugger Shop
Lawson31

JR JobanLine

Naka-city Hall

3
2

Naka

Hitachinaka

Higashi MITO Expressway

Map to J-PARC Users OfficeMembers of Users Affairs Section including UO staffs

1st row , left to right KIMURA Rie, KOYA Michiyo, ISHIKAWA Tomoko, KATOGI Aki, HOSHINO Junko, OIKAWA Kota, SOMEYA Mie.
nd2 , left to right ENDO Maya, SANAO Ai, WAKU Satoshi, HASEGAWA Shigeo, NAMIKI Shinji.
rd
3 , ISOZAKI Mari, ISHIKAWA Taeko, OKUKI Rika, HANAWA Masahiro, MAEDA Kenji, HAGIWARA Tomonori, AIZAWA Yusuke.

J-PARC Annual Report 2018

User Service

51

Activities of UO

J-PARC Users

Technical support

Technical contact
personResearch Proposal
Proposal Advisory
Committee

J-PARC Users Office
Procedures for J-PARC site
access
ID cardPortal site
Rental goods

Support Service for
Daily Life

Support for J-PARC Utilization

Accomodation
Rent-a-car
Living information

User room
Radiation/Facility
safety education

One stop service for J-PARC users

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User Service

J-PARC Annual Report 201852

User Statistics
Users in 2018 (Japanese ⁄ Foreigners, person-days)
4,500

5,000

4,000

4,500

3,500

4,000

3,000

3,500
3,000

2,500

2,500

2,000

2,000

1,500
1,000

1,500
1,000
500

500
0

Foreigners
Japanese

0

4
2017

4
2018

5

6

7

5

6

7

8

8

9

9

10

10

Users in 2018 (according to facilities,
person-days)

11

11

12

1
2019

2

12

1
2018

2

Other 0Foreign
Organizations
8,920

Nertrino
6,221

Hadron12,277

Japanese Universities
Foreign Organizations（人日）

HadronMLF
15,432Public Organizations
Other

Nertrino

PrivateEnterprises
1,504
Private Enterprises

Japanese Universities
Foreign Organizations

Accelerator

Public Organizations
Other

Private Enterprises

（人日）

3,000

2,000

2,500
2,000

1,500

1,500
1,000

1,000

0

Japanese
Universities
22,071

PublicOrganizations
3,446

2,500

500

3

Users in 2018 (according to organizations,person-days)

Accelerator
2,011

MLF

3

500
0

MLF

HadronNertrino

Accelerator

J-PARC Annual Report 2018

User Service

53

MLF Proposals Summary - FY2018
Table 1. Breakdown of Proposals Numbers for the 2018 Rounds
2018A

Beamline

2018B

Full Year

Submitted Approved Submitted Approved

Instrument

GU

GU

GU

GU

Submitted

Approved

PU/S

PU/S

IU

IU

BL01

4D-Space Access Neutron Spectrometer - 4SEASONS

18(0)

10(0)

18(0)

13(0)

1

1

1

1

BL02

Biomolecular Dynamics Spectrometer - DNA

14(1)

12(1)

25(2)

13(2)

2

1

2

1

BL03

Ibaraki Biological Crystal Diffractometer - iBIX

4
0

2
0

2
0

1
0

0
33

0
0

0
33

0
0

BL04

Accurate Neutron-Nucleus Reaction Measurement Instrument ANNRI

6

4

10

4

1

1

1

1

(100-b)
†
(b)

‡

BL05

Neutron Optics and Physics - NOP

3

3

5

5

0

0

0

0

BL06

Neutron Resonance Spin Echo Spectrometers - VIN ROSE

2

2

7

4

0

0

0

0

BL08

Super High Resolution Powder Diffractometer - S-HRPD

8

7

9

8(0)

0

0

0

0

BL09

Special Environment Neutron Power Diffractometer - SPICA

4

1

2

2

0

0

0

0

BL10

Neutron Beamline for Observation and Research Use - NOBORU

4

4

10

7

2

1

2

1

BL11

High-Pressure Neutron Diffractometer - PLANET

9(0)

7(0)

7(0)

7

0

1

0

1

BL12

High Resolution Chopper Spectrometer - HRC

8

6

7

7

1

0

1

0

BL14

Cold-neutron Disk-chopper Spectrometer - AMATERAS

34

17

24

13

3

1

3

1

BL15

Small and Wide Angle Neutron Scattering Instrument - TAIKAN

34(3)

17(3)

36(3)

22(3)

3

3

3

3

BL16

High-Performance Neutron Reflectometer with a horizontal
Sample Geometry - SOFIA

20

18

20

19

0

1

0

1

BL17

Polarized Neutron Reflectometer - SHARAKU

16(0)

11(0)

20(1)

14(1)

2

3

2

3

BL18

Extreme Environment Single Crystal Neutron Diffractometer SENJU

24(0)

12(0)

18(0)

5(0)

1

2

1

2

BL19

Engineering Diffractometer - TAKUMI

20

18

22

1

1

1

1

BL20

(100-b)Ibaraki Materials Design Diffractometer - iMATERIA
†
(b)

8
31

7
31

7
31

0
25

0
0

0
25

0
0

‡

7
31

BL21

High Intensity Total Diffractometer - NOVA

15

13

25

19

0

0

0

0

BL22

Energy Resolved Neutron Imaging System - RADEN

13(1)

12(1)

20(2)

15(2)

0

3

0

3

BL23

Polarization Analysis Neutron Spectrometer - POLANO

0

0

0

0

0

0

0

0

D1

Muon Spectrometer for Materials and Life Science Experiments D1

9(1)

6(1)

15(1)

4(1)

0

1

0

1

D2

Muon Spectrometer for Basic Science Experiments - D2

8(0)

6(0)

9(0)

6(0)

0

1

0

1

S1

General purpose µSR spectrometer - ARTEMIS

13(0)

12(0)

25(2)

18(2)

0

1

0

1

UA

Muon U

0

0

0

0

0

1

0

1

325

238

374

266

75

23

75

23

Total

GU : General Use
PU : Project Use or Ibaraki Pref. Project Use
S : S-type Proposals
IU : Instrument Group Use† : Ibaraki Pref. Exclusive Use Beamtime (β = 80% in FY2018‡ : J-PARC Center General Use Beamtime (100-β = 20% in FY2018)( ) : Proposal Numbers under New User Promotion or P-type proposals (D1,D2) in GU

User Service

J-PARC Annual Report 2018

54
Table 2. Proposals Numbers of Long Term
Proposal for the 2018 Rounds
Application

Submitted

Approved

2018

9

5

900
800

Not Approved

Proposals

700

199

Approved

600

278

142

500
400
20

200
100
0

34
67

214

FY2008FY2009

395
126

42

300

231

293

45

309

255

FY2010FY2011

460

422

469

FY2012FY2013

FY2014

607

507
321

353

FY2015FY2016FY2017FY2018Proposal RoundFig. 1. MLF Proposal Numbers over Time

KEK	
  
37	
  
5%	
  

CROSS	
  
32	
  
4%	
  

JAEA	
  
84	
  
10%	
  

Universi(es	
  (Japan)	
  Companies	
  (Japan)	
  Universi(es	
  (Japan)	
  
344	
  
43%	
  

Foreign	  Organiza(ons	
  
150	
  
19%	
  

Foreign	  Organiza(ons	
  
JAEA	
  

Companies	
  (Japan)
122	
  
15%	
  

Research	
  Ins(tutes	
  (Japan)	
  
37	
  
4%	
  

Research	
  Ins(tutes	
  (Japan)	
  

KEK	
  
CROSS	  	
  Fig. 2. Origin of Submitted Proposals by affiliation - FY2018

Figure	  2.	
  Origin	
  of	  SubmiMed	
  Proposals	
  by	
  aﬃlia(on	
  -­‐	
  FY2018

P9
13
P7 2%
43
7%

Q1
41
6%

Q2
35
5%

P1:Materials Science and Engineering
P2:Energy Science and High-Pressure Science

P1
130
21%

P3:Soft Matter, Biomaterials and Liquids
P4:Magnetism and Strongly Correlated Electron Systems (Elastic Scattering)
P5:Magnetism and Strongly Correlated Electron Systems (Inelastic Scattering)

P6
49
8%

P2
56
9%
P5
80
13%

P4
62
10%

P3
119
19%

P6:Fundamental and Nuclear Physics, Instrumentation, Imaging
P7:Industrial Applications
P8:(Reserved)
P9:Trial Use Access Program
Q1:Electronic Properties of Matter & Hydrogen in Matter
Q2:Hydrogen in Matter & General Applications

Fig. 3. Submitted Proposals by Sub-committee/Expert Panel – FY2018

J-PARC Annual Report 2018

User Service

55

J-PARC PAC Approval Summary for the 2018 Rounds
E03
P04

(Co-)
Affiliation
Title of the experiment
Spokespersons−
K.Tanida
JAEA
Measurement of X rays from Ξ Atom
U of Illinois at
J.C.Peng;
Measurement of High-Mass Dimuon Production at the
Urbana50-GeV Proton Synchrotron
S.Sawada
Champaign; KEK
Spectroscopic Study of Ξ-Hypernucleus,−+C(K , K ) Reaction

12
Ξ

Be, via the

Approval status(PAC recommendation)
Stage 2

K1.8

DeferredPrimary

Stage 2New experiment E70 based on the
S-2S spectrometer

K1.8

Beamline

E05

T.Nagae

Kyoto U

12

E06

J.Imazato

KEK

Measurement of T-violating Transverse Muon Polarization+
0 +E36 as the first stepin K -> π μ ν Decays

K1.1BR

Systematic Study of Double Strangeness System with an
Stage 2
Emulsion-counter Hybrid Method

K1.8

E07
E08
E10
E11
E13
E14
E15

E16

E17
E18
E19

K.Imai,
JAEA, Gifu U,
K.Nakazawa,
Tohoku U
H.Tamura
A.Krutenkova ITEP
A.Sakaguchi,
T.Fukuda
T. Nakaya, M.
WaschoH.Tamura
T.Yamanaka
M.Iwasaki,
T.NagaeS.Yokkaichi

R.Hayano,
U Tokyo, RIKEN
H.OutaH.Bhang,
SNU, RIKEN,
H.Outa, H.Park KRISSM.Naruki

E21

Y.KunoE22

S.Ajimura,
A.Sakaguchi

T25

S.Mihara

E26

K.Ozawa

E27

T.Nagae

E29

H.Ohnishi

E31

H.NoumiT32

A.Rubbia

P33

H.M.Shimizu

E34

T. MibeE40

M.Kohl,S.Shimizu
K.MiwaP41

M.AokiE42

J.K.Ahn

E45

K.H.Hicks,
H.SakoT46

K.Ozawa

E36

Pion double charge exchange on oxygen at J-PARC
Production of Neutron-Rich Lambda-Hypernuclei with
Osaka U, Osaka
the Double Charge-Exchange Reaction (Revised fromEC U
Initial P10)
Tokai-to-Kamioka (T2K) Long Baseline Neutrino
KEK
Oscillation Experimental Proposal
Tohoku U
Gamma-ray spectroscopy of light hypernuclei0
Osaka U
Proposal for KL -> π ν ν-bar Experiment at J-PARC
A Search for deeply-bound kaonic nuclear states by inRIKEN, Kyoto U
flight 3He(K-, n) reaction
Measurements of spectral change of vector mesons in
nuclei (previously “Electron pair spectrometer at the
RIKEN
J-PARC 50-GeV PS to explore the chiral symmetry in
QCD”)

KEK

3

Precision spectroscopy of Kaonic He 3d->2p X-rays
12
ΛCoincidence Measurement of the Weak Decay of C
and the three-body weak interaction process−−+
High-resolution Search for Θ Pentaquark in π p -> K X
Reactions

StatusIn preparation

Finished

Finished
Data analysis

Stage 1

K1.8

Stage 2

K1.8

Stage 2neutrino Data taking

Stage 2
Stage 2

K1.8
KL

Finished
Data taking

Stage 2

K1.8BR

Finished

Stage 2 for Run 0

High pRegistered as E62 with an updated
proposal

K1.8BR

Stage 2

K1.8

Stage 2

K1.8

Phase-I Stage 2
An Experimental Search for μ − e Conversion at a
Osaka UEngineering desing and operation COMET−16
Sensitivity of 10 with a Slow-Extracted Bunched Beamplan to be presented.
Exclusive Study on the Lambda-N Weak Interaction in
Osaka U
Stage 1K1.8
A=4 Lambda-Hypernuclei
Extinction Measurement of J-PARC Proton Beam at
Test Experiment
KEK
K1.8BR
K1.8BR(coord’ed by JPNC)
A
Search for ω-meson nuclear bound states in the π-+ Z ->
(A−1)
KEK
n+ ω(Z-1) reaction, and for ω mass modification in the Stage 1
K1.8
0
in-medium ω->π γ decay+
Search for a nuclear Kbar bound state K-pp in the d(π ,+Stage 2
K1.8
Kyoto UK ) reaction
Search for φ-meson nuclear bound states in the pbar +RIKEN
Stage 1
K1.1
AZ -> φ + (A-1)φ(Z-1) reaction
Spectroscopic study of hyperon resonances below KN−,
Osaka U
Stage 2
K1.8BR
threshold via the (K n) reaction on DeuteronTowards a Long Baseline Neutrino and Nucleon Decay
ETH, ZurichExperiment with a next-generation 100 kton Liquid
Test Experiment
K1.1BR
Argon TPC
Nagoya U
Measurement of Neutron Electric Dipole Moment
Deferred
Linac
An Experimental Proposal on a New Measurement of the
KEK, RIKEN
Muon Anomalous Magnetic Moment g-2 and ElectricStage 2MLF
Dipole Moment at J-PARC++++
Hampton U,
Measurement of Γ(K -> e ν)/Γ(K -> µ ν) and Search forStage 2
K1.1BR
Osaka U
heavy sterile neutrinos using the TREK detector system
Tohoku U
Measurement of the cross sections of Σp scatterings
Stage 2
K1.8
An Experimental Search for μ − e Conversion in Nuclear
Osaka U
Field at a Sensitivity of 10−14 with Pulsed Proton Beam
Deferred
MLF
from RCS
Stage 2
Pusan National Search for H-Dibaryon with a Large Acceptance Hyperon
Commissioning and physics run plan K1.8
USpectrometerto be submitted
Stage 2
PAC requests that the group further
3-Body Hadronic Reactions for New Aspects of Baryon
examine ways to reduce the total
Ohio U, JAEA
K1.8
Spectroscopy
beam time requested and to find an
efficient running scheme, including
quick but careful beam tuning.
KEK
EDIT2013 beam test program
Test Experiment
K1.1BRLi run finished, Betarget run
with S-2S

Finished

Finished

Fisnished

Finished Data
analysis
Finished

Finished Data
analysis
Data taking
Reviewed in
MLF/IMSS

Abandonded

User Service

J-PARC Annual Report 2018

56

T49

(Co-)
Affiliation
Spokespersons
T.Maruyama KEK

E50

H.NoumiOsaka U

T51

S.Mihara

KEK

T52

Y.Sugimoto

KEK

T53

D.Kawama

RIKEN

T54

K.MiwaTohoku U

T55

A.Toyoda

KEK

E56

T.Maruyama

KEK

E57

J. Zmeskal

Stefan Meyer
Institute forSubatomic
Physics

P58

M. Yokoyama U. Tokyo

T59

A. Minamino

Kyoto U

T60

T. Fukuda

Toho U

E61

M. Wilking

Stony Brook U

E62

R. Hayano,S. Okada, H.
Outa

U. Tokyo, RIKEN Precision Spectroscopy of kaonic atom X-rays with TES

Stage 2

K1.8BR

Finished

E63

H. TamuraTohoku U

Stage 2

K1.1

BL not readyyet. Exp. in

T64

Y. Koshio

Okayama U

E65
T66

T. Nakaya
T. Fukuda

P67

I. Meigo

T68

T. Fukuda

E69

A. Minamino

E70

T. Nagae

E71

T. Fukuda

E72

K. Tanida

P73

Yue MaP74

A.FelicielloP75

H.Fujioka

Approval status
Beamline
Status(PAC recommendation)
Test for 250L Liquid Argon TPC
Test Experiment
K1.1BR Withdrawn
Stage 1−
Charmed Baryon Spectroscopy via the (π,D* ) reaction The FIFC, IPNS, and E50 shouldHigh pinvestigate the beam-line feasibility
Research Proposal for COMET(E21) Calorimeter Prototype
had to be
Test Experiment
K1.1BR
Beam Test
stoppednot performed
Test of fine pixel CCDs for ILC vertex detector
Test Experiment
K1.1BR
yet
Test of GEM Tracker, Hadron Blind Detector and LeadTest Experiment
K1.1BR not performed yet
glass EMC for the J-PARC E16 experiment
Test experiment for a performance evaluation of ascattered proton detector system for the Σp scattering Test Experiment
K1.1BR not performed yetexperiment E40
Second Test of Aerogel Cherenkov counter for the J-PARC
had to be
Test Experiment
K1.1BRE36 experiment
stoppedA Search for Sterile Neutrino at J-PARC Materials and Life
Stage 2
MLF
Science Experimental Facility
Title of the experiment

Stage 1
Measurement of the strong interaction induced shift andBeam time for the pilot run to bewidth of the 1s state of kaonic deuterium at J-PARC
allocated.

K1.8BRin preparation

A Long Baseline Neutrino Oscillation Experiment Using
Deferredneutrino
J-PARC Neutrino Beam and Hyper-Kamiokande
A test experiment to measure neutrino cross sections
neutrinousing a 3D grid-like neutrino detector with a water target To be arranged by IPNS and KEK-T2K monitor Finishedat the near detector hall of J-PARC neutrino beam-line
bld
neutrino
monitor Finished
Proposal of an emulsion-based test experiment at J-PARC Arranged by IPNS and KEK-T2K
bld
Stage 1
committee encourages Lab
NuPRISM/TITUS
management to develop a plan for neutrino
reviewing the coordinated E61 andHyper-Kamiokande effort

Gamma-ray spectroscopy of light hypernuclei II

Measurement of the gamma-ray and neutron
background from the T2k neutrino/anti-neutrino at
Arranged by IPNS and KEK-T2K
neutrino
J-PARC B2 Hall
Kyoto U
Proposal for T2K Extended Run
Stage 1
neutrino
Nagoya U
Proposal of an emulsion-based test experiment at J-PARC Test Experimentneutrino
Measurement of displacement cross section of proton in
Carry out the experiment within the
JAEA
energy region between 3 and 30 GeV for high-intensityMRframework of facility development
proton accelerator facility
Extension of T60/T66 Experiment: Proposal for the Run
Nagoya U
Test Experimentneutrinofrom 2017 Autumn
Study of neutrino-nucleus ineraction at around 1GeVYokohamausing cuboid lattice neutrino detector, WAGASHI, muon
Stage 2neutrino
National U
range detectors and magnetized spectrometer, Baby
MIND, at J- PARC neutrino monitor hallStage 1
Kyoto U
Proposal for the next E05 run with the S-2S spectrometer
K1.8
Encourage to submit a TDR
Proposal for precise measurement of neutrinop-water
Nagoya U
Stage-2
neutrino
cross- section in NINJA physics run
Stage-1
PAC expects the E72 to submit a run
Search for a Narrow Λ* Resonance using the p(K-, Λ)η
JAEA
plan in the next meeting, where the K1.8BR
Reaction with the hypTPC Detector
PAC considers recommendation of astage-2 approval
Deferred
3
4
PAC will anticipate theΛH and ΛH mesonic weak decay lifetime measurement
RIKEN
K1.8BR
recommendation for stage-1
3,4
−
0 3,4
with He(K , π ) ΛH reaction
approval of one hypertriton lifetime
measurement in the next PAC meeting.
Deferred
PAC will anticipate the
Direct measurement of the 3ΛH and 4ΛH lifetimes using
INFN, Torino
recommendation for stage-1
K1.1
the 3,4He(π-, K0)3,4ΛH reactions
approval of one hypertriton lifetime
measurement in the next PAC meeting.
Deferred
PAC encourages the proponent to
Decay Pion Spectroscopy of 5ΛΛH Produced by
update the proposal for a stage-1
Tokyo Inst. Tech,
K1.8
approval. The requested beam time
Ξ-hypernuclear Decay
should be finally revised, taking into
account the data taken by E70.

Organization and Committees

Organization and Committees

J-PARC Annual Report 201858

Organization Structure

When applicable

J-PARC Center Management System Chart

Head Deputy Head
Leader ‒ Sub Leader‒

as of April 1, 2018

Deputy Director(Safety)

T. Ishii

Safety Division

Y. Kasugai - M. Numajiri, K. Seki

Y. Miyamoto - K. Bessho, Y. Nakane
Y. Nakane

H. Oguri

K. Yamamoto

Accelerator Division
K. Hasegawa - M. Kinsho, F. Naito

N. Hayashi
M. Yoshii
N. Yamamoto
F. Naito

N. Saito

Director

H. Takada - K. Haga

Deputy Director(JAEA)

M. Futakawa

K. Nakajima - S. Itoh

Materials & Life Science Division
T. Kanaya - K. Soyama, K. Aizawa
T. Otomo, Y. Miyake

K. Sakasai
R. Kadono - N. Kawamura
K. Aizawa - T. Oku

Deputy Director(KEK)

T. Koseki

Director’s Oﬃce
Advisor (J-PARC) : S. Nagamiya
Advisor (J-PARC) : Y. Ikeda
Advisor (J-PARC) : Y. Fujii
Advisor (J-PARC) : M. Takasaki
Advisor (J-PARC) : T. Ohska

T. Nakadaira

T. Kobayashi - T. Komatsubara, Y. Fujii

NuclearM. Futakawa - F. Maekawa

S. Sawada

T. Sasa
S. Meigo

Y. Makita - K. Sasaki

A. Manabe - K. Gorai

K. Soyama

T. Koseki - S. Waku

Y. Yamazaki - Y. Miyamoto
H. Koda - K. Suzuki
Y. Fukuda - H. Koda

S. Waku - J. Hoshino
Users Oﬃce

K. Maeda

J-PARC Annual Report 2018

Organization and Committees

59

Members of the Committees Organized for J-PARC(as of March, 2019)1) Steering Committee
Junji Haba

High Energy Accelerator Research Organization (KEK), Japan

Toshikazu Ishii

High Energy Accelerator Research Organization (KEK), Japan

Katsuo Tokusyuku

High Energy Accelerator Research Organization (KEK), Japan

Nobuhiro Kosugi

High Energy Accelerator Research Organization (KEK), Japan

Seiya Yamaguchi

High Energy Accelerator Research Organization (KEK), Japan

Yukitoshi Miura

Japan Atomic Energy Agency (JAEA), Japan

Yutaka Maeda

Japan Atomic Energy Agency (JAEA), Japan

Masayasu Takeda

Japan Atomic Energy Agency (JAEA), Japan

Hiroyuki Oigawa

Japan Atomic Energy Agency (JAEA), Japan

Kazuo Minato

Japan Atomic Energy Agency (JAEA), Japan

Naohito Saito

J-PARC Center, Japan

2) International Advisory Committee
Jean-Michel Poutissou

TRIUMF, Canada

Thomas Prokscha

The Paul Scherrer Institute (PSI), Switzerland

Jun Sugiyama

Toyota Central R & D Labs., Inc., Japan

Jie Wei

Michigan State University, USA

Roland Garoby

European Spallation Source, Sweden

Eckhard Elsen

European Organization for Nuclear Research (CERN), Switzerland

Patricia McBride

Fermi National Accelerator Laboratory (FNAL), USA

Robert Tribble

Brookhaven National Laboratory (BNL), USA

Donald F. Geesaman

Argonne National Laboratory, USA

Paolo Giubellino

GSI Helmholzzentrum für Schwerionenforschung, Germany

Hamid Aït Abderrahim

SCK • CEN, Belgium

Akira Hasegawa

Tohoku University, Japan

Paul Langan

Oak Ridge National Laboratory (ORNL), USA

Hidetoshi Fukuyama

Tokyo University of Science, JapanDan Alan Neumann

National Institute of Standards and Technology (NIST), USA

Andrew Dawson Taylor

Science and Technology Facilities Council (STFC), UK

Helmut Schober

Institut Laue–Langevin, France3) User Consultative Committee for J-PARC
Tsuyoshi Nakaya

Kyoto University, Japan

Taku Yamanaka

Osaka University, Japan

Hiroaki Aihara

University of Tokyo, Japan

Takashi Kobayashi

High Energy Accelerator Research Organization (KEK), Japan

Hirokazu Tamura

Tohoku University, Japan

Tomofumi Nagae

Kyoto University, Japan

Hiroyuki Noumi

Osaka University, Japan

Organization and Committees

J-PARC Annual Report 201860

Shinya Sawada

High Energy Accelerator Research Organization (KEK), Japan

Toshiyuki Takahashi

High Energy Accelerator Research Organization (KEK), Japan

Masaki Fujita

Tohoku University, Japan

Naoya Torikai

Mie University, Japan

Osamu Yamamuro

University of Tokyo, Japan

Yasushi Idemoto

Tokyo University of Science, Japan

Yoshiaki Kiyanagi

Nagoya University, Japan

Tosiji Kanaya

High Energy Accelerator Research Organization (KEK), Japan

Jun Akimitsu

Okayama University/Hiroshima University, Japan

Tadashi Adachi

Sophia University, Japan

Yasuhiro Miyake

High Energy Accelerator Research Organization (KEK), JapanJun Sugiyama

Toyota Central R&D Labs., Inc.

Hiroyuki Kishimoto

Sumitomo Rubber Industries, Ltd.

Masaaki Hibi

Nippon Steel & Sumitomo Metal Corp.

Kenya Kubo

International Christian University, Japan

Toshiro Tomida

Ibaraki Prefecture

Satoru Yamashita

University of Tokyo, Japan

Cheol-Ho Pyeon

Kyoto University, Japan

Yoshiyuki KajiJapan Atomic Energy Agency (JAEA), Japan

4) Accelerator Technical Advisory Committee
Wolfram Fischer

Brookhaven National Laboratory (BNL), USA

Mats Lindroos

European Spallation Source, Sweden

John Thomason

Science and Technology Facilities Council (STFC), UK

Sheng Wang

Institute of High Energy Physics (IHEP), China

Toshiyuki Shirai

National Institutes for Quantum and Radiological Science and Technology (QST),Japan

Michael Plum

Oak Ridge National Laboratory (ORNL), USA

Jie Wei

Michigan State Univ., USA

Robert Zwaska

Fermi National Accelerator Laboratory (FNAL), USA

Simone Gilardoni

European Organization for Nuclear Research (CERN), Switzerland

5) Neutron Advisory Committee
Robert McGreevy

Science and Technology Facilities Council (STFC), UK

Bertrand Blau

Paul Scherrer Institut (PSI), Switzerland

Mark Wendel

Oak Ridge National Laboratory (ORNL), USA

Yoshiaki Kiyanagi

Nagoya University, Japan

Christiane Alba-Simionesco

The Laboratoire Leon Brilloin (LLB), France

Jamie Schulz

Australian Nuclear Science and Technology Organization(ANSTO), Australia

Andreas Schreyer

European Spallation Source, Sweden

Sung-Min Choi

Korea Advanced Institute of Science and Technology, Korea

Yoshie Otake

RIKEN, Japan

Masaaki Sugiyama

Kyoto University, Japan

Christian Rüegg

The Paul Scherrer Institute (PSI), Switzerland

J-PARC Annual Report 2018

Organization and Committees

616) Muon Advisory Committee
Martin Månsson

KTH Royal Institute of Technology, Sweden

Thomas Prokscha

Paul Scherrer Institut (PSI), Switzerland

Andrew MacFarlane

University of British Columbia, Canada

Klaus Kirch

Paul Scherrer Institut (PSI), Switzerland

Kenya Kubo

International Chiristian University, Japan

Tadayuki Takahashi

University of Tokyo, Japan

Takashi Nakano

Osaka University, Japan

Hiroshi Amitsuka

Hokkaido University, Japan

7) Radiation Safety Committee
Yoshimoto Uwamino

RIKEN, Japan

Yoshihiro Asano

University of Hyogo, Japan

Hiroshi Watabe

Tohoku University, Japan

Takeshi Iimoto

University of Tokyo, Japan

Takeshi Murakami

National Institute of Radiological Science, Japan

Hitoshi Kobayashi

High Energy Accelerator Research Organization (KEK), Japan

Yoshihito Namito

High Energy Accelerator Research Organization (KEK), Japan

Shinichi Sasaki

High Energy Accelerator Research Organization (KEK), Japan

Kazuo Minato

Japan Atomic Energy Agency (JAEA), Japan

Michio Yoshizawa

Japan Atomic Energy Agency (JAEA), Japan

Nobuyuki Kinouchi

Japan Atomic Energy Agency (JAEA), Japan

8) Radiation Safety Review Committee
Tetsuro Ishii

Japan Atomic Energy Agency (JAEA), Japan

Yukihiro Miyamoto

Japan Atomic Energy Agency (JAEA), Japan

Masaharu Numajiri

High Energy Accelerator Researchi Organization (KEK), Japan

Hidetoshi Kikunaga

Tohoku University, Japan

Hiroshi Yashima

Kyoto Univaersity, Japan

Kanenobu Tanaka

Institute of Physical and Chemical Research (RIKEN), Japan

Shunsuke Yonai

National Institute for Quantum and Radiological Science and Technoloty (QST), Japan

Yasuhiro Yamaguchi

Comprehensive Reserch Organization for Science and Society (CROSS), Japan

Akira Hirose

Japan Atomic Energy Agency (JAEA), Japan

Akihiko Osa

Japan Atomic Energy Agency (JAEA), Japan

Makoto Kobayashi

Japan Atomic Energy Agency (JAEA), Japan

Nobukazu Toge

High Energy Accelerator Researchi Organization (KEK), Japan

Kazuyoshi MasumotoHigh Energy Accelerator Researchi Organization (KEK), Japan

Hiroshi Matsumura

High Energy Accelerator Researchi Organization (KEK), Japan

Kazuo Hasegawa

Japan Atomic Energy Agency (JAEA), Japan

Yoshiaki Fujii

High Energy Accelerator Researchi Organization (KEK), Japan

Takeshi Komatsubara

High Energy Accelerator Researchi Organization (KEK), Japan

Kazuhiko Soyama

Japan Atomic Energy Agency (JAEA), Japan

Kotaro BesshoHigh Energy Accelerator Researchi Organization (KEK), Japan

Yoshimi Kasugai

Japan Atomic Energy Agency (JAEA), Japan

Organization and Committees

J-PARC Annual Report 2018

629) MLF Advisory Board
Jun Akimitsu

Okayama University/Hiroshima University, Japan

Masaaki Sugiyama

Kyoto University, Japan

Yoshiaki Kiyanagi

Nagoya University, Japan

Mitsuhiro Shibayama

The University of Tokyo, JapanJun Sugiyama

Toyota Central R&D Labs., Inc., Japan

Jun Takahara

Kyusyu University, Japan

Takahisa Arima

The University of Tokyo, Japan

Michihiro Furusaka

National Institute of Advanced Industrial Science and Technology (AIST), Japan

Masaki Takada

Tohoku University, Japan

Toshio Yamaguchi

Fukuoka University, Japan

Hiroshi Amitsuka

Hokkaido University, Japan

Kenya Kubo

International Christian University, Japan

Toshiji Kanaya

High Energy Accelerator Research Organization (KEK), Japan

Hideki Seto

High Energy Accelerator Research Organization (KEK), Japan

Takashi Kamiyama

High Energy Accelerator Research Organization (KEK), Japan

Toshiya Otomo

High Energy Accelerator Research Organization (KEK), Japan

Yasuhiro Miyake

High Energy Accelerator Research Organization (KEK), Japan

Ryosuke KadonoHigh Energy Accelerator Research Organization (KEK), Japan

Masatoshi Futakawa

Japan Atomic Energy Agency (JAEA), Japan

Kazuya Aizawa

Japan Atomic Energy Agency (JAEA), Japan

Masayasu Takeda

Japan Atomic Energy Agency (JAEA), Japan

Kazuhiko Soyama

Japan Atomic Energy Agency (JAEA), Japan

Kenji Nakajima

Japan Atomic Energy Agency (JAEA), Japan

Yukinobu Kawakita

Japan Atomic Energy Agency (JAEA), Japan

Jun-ichi Suzuki

Comprehensive Research Organization for Science and Society (CROSS), Japan

10) Program Advisory Committee (PAC) for Nuclear and Particle Physics Experiments at the J-PARC 50Gev Proton
Synchrotron
Nori Aoi

Osaka University, Japan

Ryuichiro Kitano

High Energy Accelerator Research Organization (KEK), Japan

Masahiro Kuze

Tokyo Institute of Technology, Japan

Hirokazu Tamura

Tohoku University, Japan

Ichiro AdachiHigh Energy Accelerator Research Organization (KEK), Japan

Yoshitaka Itow

High Energy Accelerator Research Organization (KEK), Japan

Akira Ohnishi

Kyoto University, Japan

Deborah Harris

Fermi National Accelerator Laboratory (FNAL), USA

Steven Kettell

Brookhaven National Laboratory (BNL), USA

Josef Pochodzalla

University of Mainz, Germany

Monika Blanke

Karlsruhe Institute of Technology, Germany

Francois Le Diberder

The French National Institute of Nuclear and Particle Physics (IN2P3), France

Anthony William Thomas

University of Adelaide, Australia

Nu Xu

Lawrence Berkeley National Laboratory, USA

Rikutaro YoshidaThomas Jefferson National Accelerator Facility, USA

J-PARC Annual Report 2018

Organization and Committees

6311) TEF Technical Advisory Committee
Marc Schyns

SCK • CEN, Belgium

Michael Butzek

Forschungszentrum Jülich, Germany

Michael WohlmutherPaul Scherrer Institut (PSI), Switzerland

Yoshiaki Kiyanagi

Nagoya University, Japan

Keishi Sakamoto

National Institutes for Quantum and Radiological Science and Technology (QST), Japan

Georg Müller

Karlsruhe Institute of Technology, Germany

Masatoshi Kondo

Tokyo Institute of Technology, Japan

Main Parameters

Main Parameters

J-PARC Annual Report 201866
Present main parameters of Accelerator
Linac
Accelerated Particles
Negative hydrogen
Energy400 MeVPeak Current
50 mA
0.27 ms for MLF
0.50 ms for MR-FX
0.10 ms for MR-SX

Pulse Width
Repetition Rate
Freq. of RFQ, DTL, and SDTL
Freq. of ACS

25 Hz
324 MHz972 MHzRCS

Circumference
Injection Energy
Extraction Energy
Repetition Rate
RF Frequency
Harmonic Number
Number of RF cavities
Number of Bending Magnet

348.333 m
400 MeV
3 GeV
25 Hz
0.938 MHz → 1.67 MHz2
12
24
Main Ring

Circumference
Injection Energy
Extraction Energy
Repetition Rate
RF Frequency
Harmonic Number
Number of RF cavities
Number of Bending Magnet

1567.5 m
3 GeV
30 GeV~0.4 Hz1.67 MHz → 1.72 MHz
9996

Key parameters of Materials and Life Science Experimental Facility
Injection energy
3 GeV
Repetition rate
25 Hz
Neutron Source
Target material
Mercury
Number of moderators
3
Moderator material
Liquid hydrogen
Moderator temperature/pressure
20 K/1.5 MPa
Number of neutron beam extraction ports
23
Muon production target
Target material
Graphite
Number of muon beam extraction ports
4
Neutron instruments *Open for user program (general use)
20
Under commissioning/construction
1/0
Muon Instruments *Open for user program (general use)3
Under commissioning/construction
1/0(* As of March, 2018)

Events

EventsSafety Day at J-PARC (May 25)
To improve safety awareness of the staff and ensure that the lessons of the radioactive material leakaccident at the Hadron Experimental Facility on May
23, 2013, are not forgotten, the J-PARC Center holds a
Safety Day on the fourth Friday of May every year. The
2018 Safety Day was May 25, and the event included
two sessions, a “Meeting to exchange information on
safety” in the morning, and a “5/23 workshop for fostering safety culture” in the afternoon.

J-PARC “Hello Science” - Reducing waste
in nuclear power generation in hybrid
nuclear reactor- nuclear reactor driven
by accelerators, and the acceleratordriven system- (June 29)
The J-PARC Center holds a science café named“Hello Science” every month at the Tokai Village Industry and Information Plaza “Ivill” in Ibaraki Prefecture. In
June, Dr. Toshinobu Sasa, the leader of the Target Technology Development Section, Nuclear Transmutation
Division, delivered a lecture on nuclear transmutation
technology. That technology uses an accelerator toEvents

J-PARC Annual Report 201868
reduce the harm from the waste in the nuclear power
generation. He explained that J-PARC has been conducting research to build a new nuclear reactor called“Accelerator-Driven System” (ADS), which transmutes
nuclear waste efficiently and safely by combining an
accelerator and a nuclear reactor.

J-PARC Exhibited at the GSA (GEO SPACEADVENTURE) 2018 (July 14-15)
The GSA is an underground exploration event held
every summer, which is performed in Kamioka-cho,
Gifu Prefecture, using the actual tunnel of the Kamioka
mine and the cutting-edge research facilities of astrophysics, such as Super Kamiokande (SK). The event isorganized by the “GSA Executive Committee”, which isput on by Hida citizens and volunteer staff. Since 2017,
we have been contributing to it as an exhibitor.
At the Kamioka-cho Community Center, we performed briefings about the experiment of the Gauss
exhibit, and the experiments in J-PARC, including theT2K Experiment.

Saito, Director of the J-PARC Center, reported the present state of the adoption of more than 500 proposals so
far on the industrial use and the successful stable operation of MLF for approximately one hour at a beam
power of 1MW in early July.

J-PARC runs a booth “Eco Accelerated
with J-PARC” at Eco Festival Hitachi 2018
(July 21)
J-PARC ran a booth at Eco Festival Hitachi 2018 at
the Hitachi Civic Center. We introduced our research activities and explained the functions of our facilities, andexhibited Sumitomo Rubber Industries, Ltd.’s high-performance tire. It was an anti-wear tire product improvedby using MLF’s neutron beam. In addition, at a superconductive coaster experiment corner, many children
excitedly worked on the experiment.

J-PARC Center’s outreach activities(August 1-2, 4, 22, 24, 28)
The J-PARC Center conducts scientific experimentclasses at schools, libraries and other facilities during
the school summer vacation, with the aim to encouragechildren’s interest in science. The center held the eventson the topics of light, accelerators, and energy.

The Gauss Accelerator
At Tokai Library

Debriefing on the industrial use of JPARC MLF in fiscal year 2018 (July 23-24)
We held a debriefing on the industrial use of theMaterial and Life Science Experimental Facility (MLF) in
Tokyo, and over 300 people from the government, various industries and the academia visited the venue. At
the debriefing, we also held a commemorative session
celebrating the 10th anniversary of the inaugurationof the Industrial Users Society for Neutron Application.
It launched at the same time when MLF user operation started. Vice-president Etsuhiko Shoyama, who isamong the promoters, expressed his thoughts. Naohito

2018 opening of J-PARC’s facilities to the
public (August 19)
We conducted the 2018 opening of the J-PARC facilities to the public. Approximately 1,500 people visitedthe usually inaccessible facilities, such as accelerators
in a tunnel and experimental facilities. There were also
some seminars on J-PARC’s cutting-edge research activities, science café on elementary particle and material and life science.

J-PARC Annual Report 2018

Events69

Visitors looking at electromagnets in the MR tunnel
People observing different light sources

Participation in the 6th Ozora Marche2018 event with a booth, J-PARC Science
Experience Corner (October 21)

Nagoya University branch office established in J-PARC (October 26)

The 6th Ozora Marche event took place at Daijingu and Muramatsusan Kokuzodo in Tokai Village. This
year, J-PARC had a joint booth with the Nuclear Science Research Institute, a research division of the Japan
Atomic Energy Agency (JAEA), to introduce J-PARC’s
experimental facilities and the generated results thatfound industrial use. Visitors also enjoyed the experiment of a superconductive rollercoaster.

There was a signing ceremony at the J-PARC Research Building between the High Energy Accelerator
Research Organization (KEK) and Nagoya University
on the memorandum to establish a research base. The
establishment of a branch office of that university follows the ones by Osaka University in March 2016, Kyoto
University in February 2017, and Kyushu University in
March 2018.

Experiment of superconductive roller coaster

Masahide Takahashi, Trustee and Vice President of Nagoya University (left), Yasuhiro Okada, Executive Director of KEK (right)

J-PARC Science Café, “Hello Science”
Workshop, featuring “Let’s Create an
Optical Kaleidoscope” held during the
Nuclear Fusion Facility Visiting Tour (October 21)
The Naka Fusion Institute, a division of the National
Institute for Quantum and Radiological Science andTechnology (QST), received visitors for a facility study
tour. The J-PARC Center offered a craft/experiment classof the “Hello Science” Workshop,“Let’s Create an Optical Kaleidoscope”.

Special request event of “Hello Science”(October 26)
Our science communicator Dr. Shinichi Sakamotoexplained three topics previously requested by participants: a review of the standard model of the elementary particles, the CP symmetry breaking of neutrinos,
and the observation of gravitational waves.

Events

J-PARC Annual Report 201870

Three public lectures held by the Japan
Society for Neutron Science (December 8)

Dr. Shinichi Sakamoto explaining neutrino oscillation withhandmade coordinate axis models

g-2/EDM collaboration meeting(May 14-17, November 20-23)
There were two collaboration meetings on the E34
experiment in 2018 at J-PARC. The experiment’s topic
is the muon anomalous magnetic dipole movement(g-2)/electric dipole moment (EDM). About 60 and 50
researchers attended them, respectively.

A series of public lectures organized by the Japan
Society for Neutron Science was held at the Ibaraki
Quantum Beam Research Center (IQBRC). The titles of
the three lectures were: “Are neutron beams useful? Living, industry, medicine and space”, “Utilization of neutron beams that open up future applications in living,industry and medicine” and “What you should know
about particle therapy for cancer treatment”.

KOTO Experiment collaboration meeting (June 13-15, December 14-16)
The KOTO Experiment on the rare decay of the neutral kaon has been running at the Hadron Experimental
Facility as an international collaborative research project. To promote this research, the group holds meetings
twice a year.

A group photo of the participantsParticipants of the workshop

Third Neutron and Muon School(November 20-24)
The J-PARC Center and the Comprehensive Research Organization for Science and Society (CROSS)
held the third Neutron and Muon School jointly with
11 organizations in Japan. The school drew some 35
students and young researchers from Japan, China,
South Korea, India, Thailand, Russia and Great Britain.
It also functioned as an international forum for humanresource training by J-PARC.

Reimei Workshop ”J-PARC-HI opens up
the Physics of High-Density Materials
and Strangeness” (December 15)
J-PARC held a workshop to study the strangeness ofthe highest density matter in the universe. Around 60
researchers in the field of nuclear physics discussed thesignificance of the J-PARC Heavy Ion Project (J-PARCHI).

6th Accelerator Facility Safety Symposium (January 24-25)
The 6th Accelerator Facility Safety Symposium washeld at the Ibaraki Quantum Beam Research Center(IQBRC). Various initiatives were introduced under thetheme of personal dose management and fire emer-

J-PARC Annual Report 2018

Events71
gency response at accelerator facilities. Mr. Fabian
Saretzki, in charge of safety at accelerator facilities inGermany, gave a talk on the fire emergency response
measures at European XFEL, which operates a 3-km
long accelerator tunnel.

A group photo of the participants

J-PARC “Hello Science” - “Investigating
the matter inside neutron stars based on“strange” nuclei (January 25)

J-PARC “Hello Science” - Visualization of
secondary lithium-ion batteries using
neutron beams (February 22)
Dr. Masao Yonemura delivered a lecture on theforefront of research and development of batteries
that utilize neutron beams created at MLF’s Special
Environment Neutron Diffractometer (BL09 SPICA). He
explained what reaction would take place inside a lithium-ion secondary battery and what to do to improve
its performance.

Okayama University signed the MOU towards establishing a J-PARC branch office (March 14)
The signing ceremony of “Memorandum of Understanding on Establishing an Education and Research
Hub between KEK and Okayama University” was heldin Tokyo.

Neutron stars are thought to be the densest objects in the universe, and a research on the hyper-nuclei
containing strange quarks is currently underway to understand the matter, which forms the neutron stars. Dr.
Toshiyuki Takahashi of the Hadron Section presented
an introductory overview of the research.

J-PARC “Hello Science” Exhibition at the26th Hitachi Science Show Festival(February 3)
The J-PARC “Hello Science” Exhibition at the 26th
Hitachi Science Show Festival was held on February 3.

Masanori Yamauchi, KEK Director General (left) and Hirofumi
Makino, President of Okayama University (right)

The Quantum Beam Science Festa 2018,
10th Symposium/36th PF Symposium(March 12-13)
The Quantum Beam Science Festa was held under
the joint auspices of KEK IMSS and J-PARC Center MLF. It
attracted approximately 580 participants.

What color is light?

At the Tsukuba International Congress Center

Events

J-PARC Annual Report 201872

T2K collaboration meeting (May 8-12, August 20-25, December 3-7, March 25-29)
In fiscal year 2018, T2K collaboration meetings were
held four times. Three of them were in the Ibaraki Quantum Beam Research Center (IQBRC) in Tokai Village, theAugust meeting was held in Toyama Prefecture.

Source Facilities” as a J-PARC Workshop. There wereabout 90 participants and 11 facilities presented theirreports.

Visitors
In fiscal year 2018, J-PARC was visited by the following
distinguished guests:
Taylor Wilson, nuclear physicist (April 12, November 15)
His Excellency Magnus Robach, Swedish Ambassador
to Japan (November 13)
Yoshimasa Uno, Vice Governor of Ibaraki Prefecture (December 3)

The lecture at IQBRC

Liu Weiping, Vice President of the China Institute ofAtomic Energy (CIAE) (December 5)

J-PARC Workshop “Collaborative Research Conference of Small to Large Facilities” (March 28)

Mary Alice Hayward, the Deputy Director General andHead of the Department of Management of the International Atomic Energy Agency (IAEA) (January 23)

The Japanese Society for Neutron Science, the
J-PARC Center, and Japan Collaboration Acceleratordriven Neutron Sources (JCANS) jointly held a “Collaborative Research Conference of Small to Large Neutron

Keiko Nagaoka, Vice Minister of the Ministry of Education, Culture, Sports, Science and Technology (MEXT)(January 24).

In total, there were 2,957 visitors to J-PARC for the period from April 2018 to the endof March 2019.
ln-house

Public Officers

4%

VIP, lawmakers 1%

Foreigners
16%

University
students,
experts

27%

10%
14%

Business
15%
Local
residents
12%

Media 1%

Junior-high/High school
students, teachersPublications

Publications

J-PARC Annual Report 201874

Publications in Periodical Journals
A-001
S. Lee, et al.
Crystal and Magnetic Structures of
La2CoPtO6 Double Perovskite
ACS Omega, Vol. 3, 11624
A-002
T. Takami, et al.
Appearance of Lithium-Ion Conduction in a
La–Li–Co–O Band Insulator: Possible Routeto Oxide Electrolyte
ACS Appl. Energy Mater., Vol. 1, 2546
A-003
N. Yano, et al.
Status of the neutron time-of-flight singlecrystal diffraction data-processing software
STARGazer
Acta Crystallogr. D STRUCTURAL BIOLOGY, Vol.
D74, 1041-1052
A-004
J. W. Bae, et al.
Exceptional phase-transformation
strengthening of ferrous medium-entropy
alloys at cryogenic temperatures
ACTA MATER., Vol. 161, 388-399

A-010
C. H. Lee, et al.
Effect of rattling motion without cage
structure on lattice thermal conductivity in
LaOBiS2–xSex
Appl. Phys. Lett., Vol. 112, 023903
A-011
K. Abe, et al.
Search for Neutrinos in Super-Kamiokande
Associated with the GW170817 Neutron-starMergerAstrophys. J. Lett., Vol. 857, L4
A-012
Z. Tan, et al.
Synthesis, Structural and Magnetic
Properties of La0.5Ba0.5CoO2.75+x
Atom Indonesia, Vol. 44, 49
A-013
M. Hirai, et al.
Direct evidence for the effect of glycerol onprotein hydration and thermal structuraltransition
Biophys. J., Vol. 115, 313-327

A-005
K. Suekuni, et al.
Retreat from stress: rattling in a planar
coordination
Adv. Mater., Vol. 30, 1706230

A-014
Y. Kameda, et al.
Neutron Diffraction Study on Partial Pair
Correlation Functions of Water at Ambient
Temperature
Bull. Chem. Soc. Jpn., Vol. 91, 1586-1595

A-006
K. Tomiyasu, et al.
Quantum paramagnet near spin-statetransition
Advanced Quantum Technologies, 2018,
1800057

A-015
H. Nishihara, et al.
Graphene-based ordered framework with adiverse range of carbon polygons formed inzeolite nanochannels
Carbon, Vol. 129, 854-862

A-007
K. Ikeuchi, et al.
Al-impurity-induced magnetic
excitations in heavily over-doped
La1.7Sr0.3Cu0.95Al0.05O4
AIP Adv., Vol. 8, 101318

A-016
M. Yoshimoto, et al.
Mesoscopic investigation of an “immiscible”
cyclohexane and water micro-mixture incarbon micropores by contrast variation
small-angle neutron scattering
Chem. Lett., Vol. 47, 336-339

A-008
Y. Fukushima, et al.
Dynamic of organic species in organo-clay/ polypropyrene composite by quesi-elastic
neutron scattering
Appl. Clay Sci., Vol. 155, 15-19
A-009
H. Iwase, et al.
Structural investigation of hectorite aqueous
suspensions by dielectric microscopy andsmall-angle neutron scattering couplingwith rheological measurement
Appl. Clay Sci., Vol. 157, 24-30

A-017
K. Kataoka, et al.
High ionic conductor member of garnet‐
type oxide Li6.5La3Zr1.5Ta0.5O12
ChemElectroChem, Vol. 5, 2551-2557
A-018
S. Takada, et al.
Visualization of He II boiling process underthe microgravity condition for 4.7 s by usinga drop tower experiment
Cryogenics, Vol. 89, 157
A-019
T. Yagai, et al.

Development of design for large scaleconductors and coils using MgB2 forsuperconducting magnetic energy storage
deviceCryogenics, Vol. 96, 75
A-020
A. Chanyshev, et al.
High-Pressure - High-Temperature Study ofBenzene: Refined Crystal Structure and New
Phase Diagram up to 8 GPa and 923K
Cryst. Growth Des., Vol. 18, 3016-3026
A-021
Y. Muraba, et al.
Phase transition in CaFeAsH: bridging 1111
and 122 iron-based superconductors
Dalton Transactions, Vol. 47, 12964-12971
A-022
A. M. Baldini, et al.
The design of the MEG II experiment
EPJ C, Vol. 78, 380
A-023
N. Naganawa, et al.
A Cold/Ultracold Neutron Detector using
Fine-grained Nuclear Emulsion with Spatial
Resolution less than 100 nm
EPJ C, Vol. 78, 959
A-024
H. Iwamoto, et al.
Sensitivity and uncertainty analysis of beff
for MYRRHA using a Monte Carlo technique
EPJ Nucl. Sci. Technol., Vol. 4, 42
A-025
Y. Seki, et al.
Efficient phase imaging using wavelengthresolved neutron Talbot-Lau interferometry
with TOF method
EPL, Vol. 123, 12002
A-026
S. Kumano, et al.
Hadron Tomography and Its Application to
Gravitational Radii of Hadrons
Few-Body Syst., Vol. 59, 102
A-027
K. Mishima, et al.
Accurate determination of the absolute
3He/4He ratio of a synthesized helium
standard gas (Helium Standard of Japan,
HESJ): Towards revision of the atmospheric
3He/4He ratio
Geochemistry, Geophysics, Geosystems, Vol.
19, 3995-4005
A-028
T. Suwa, et al.
Evaluation of Thermal Strain Induced in
Components of Nb3Sn Strand During

J-PARC Annual Report 2018

Publications

75
Cooling
IEEE Trans. Appl. Supercond., Vol. 28, 1-4
A-029
M. Sugano, et al.
Training Performance With Increased Coil
Prestress of the 2 m Model Magnet of Beam
Separation Dipole for the HL-LHC Upgrade
IEEE Trans. Appl. Supercond., Vol. 28, 4000805
A-030
Y. Yang, et al.
Study of Irradiation Effects on Thermal
Characteristics for COMET Pion Capture
SolenoidIEEE Trans. Appl. Supercond., Vol. 28, 4001405
A-031
K. Suzuki, et al.
Quench Protection Heater Study With the
2-m Model Magnet of Beam Separation
Dipole for the HL-LHC Upgrade
IEEE Trans. Appl. Supercond., Vol. 28, 4002505

A-038
S. Manabe, et al.
Negative and Positive Muon-Induced Single
Event Upsets in 65-nm UTBB SOI SRAMs
IEEE Trans. Nucl. Sci., Vol. 65, 1742
A-039
N. M. Truong, et al.
Real-Time Lossless Compression of
Waveforms Using an FPGAIEEE Trans. Nucl. Sci., Vol. 65, 2650
A-040
Y. Higaki, et al.
Counteranion-Specific Hydration States of
Cationic Polyelectrolyte Brushes
Ind. Eng. Chem. Res., Vol. 57, 5268–5275
A-041
K. Asano, et al.
Structural Variation of Self-Organized Mg
Hydride Nanoclusters in Immiscible Ti Matrix
by Hydrogenation
Inorg. Chem., Vol. 57, 11831–11838

A-032
E. Nilsson, et al.
Influence of 3-D Effects on Field Quality in
the Straight Part of Accelerator Magnets for
the High-Luminosity Large Hadron Collider
IEEE Trans. Appl. Supercond., Vol. 28, 4003005

A-042
F. Takeiri, et al.
A Fluorine-rich Perovskite Oxyfluoride
AgFeOF2
Inorg. Chem., Vol. 57, 6686-6691

A-033
S. Enomoto, et al.
Field Measurement to Evaluate Iron
Saturation and Coil End Effects in a Modified
Model Magnet of Beam Separation Dipole
for the HL-LHC Upgrade
IEEE Trans. Appl. Supercond., Vol. 28, 4004505

A-043
W. Gong, et al.
Deformation behavior of as-cast andas-extruded Mg97Zn1Y2 alloys during
compression, as tracked by in situ neutron
diffraction
Int. J. Plast., Vol. 111, 288-306

A-034
T. Takayanagi,et al.
A New Pulse Magnet for the RCS Injection
Shift Bump Magnet at J-PARC
IEEE Trans. Appl. Supercond., Vol. 28, 4100505

A-044
K. Itoh, et al.
Inhomogeneity of local packing density andatomic bonding of Ni67Zr33 amorphousalloy
J. ALLOYS COMPD., Vol. 732, 585-592

A-035
M. Aoki, et al.
Evaluation of Strain Dependence ofSuperconducting Magnet Quenches byUsing a Three-Point Bending Test StandIEEE Trans. Appl. Supercond., Vol. 28, 4702904
A-036
M. Tomita, et al.
Superconducting Properties of a Prototype
Pancake Coil Using a MgB2 Rutherford-Type
Stranded Conductor
IEEE Trans. Appl. Supercond., Vol. 28, 5700604
A-037
Wang L., et al.
Measurement and Mechanism Investigationof Negative and Positive Muon-Induced
Upsets in 65nm Bulk SRAMs
IEEE Trans. Nucl. Sci., Vol. 65, 1734

A-045
T. Ohkubo
Insights from ab initio molecular dynamics
simulations for a multicomponent oxide
glass
J. Am. Ceram. Soc., Vol. 101, 1122-1134
A-046
N. Matsui, et al.
Ambient pressure synthesis of La2LiHO3
as a solid electrolyte for a hydrogenelectrochemical cell
J. Am. Ceram. Soc., Vol. 102, 3228−3235
A-047
H. Yamashita, et al.
Chemical Pressure-induced Anion Orderdisorder Transition in LnHO Enabled byHydride Size Flexibility
J. Am. Chem. Soc., Vol. 140, 11170-11173

A-048
Y. Nagata, et al.
Elucidating the solvent effect on the switchof the helicity of poly(quinoxaline-2,3-diyl)s: A conformational analysis by small-angle
neutron scattering
J. Am. Chem. Soc., Vol. 140, 2722-2726
A-049
T. Okuchi, et al.
Quasielastic neutron scattering of brucite to
analyse hydrogen transport on the atomic
scale
J. Appl. Crystallog., Vol. 51, 1564-1570
A-050
T. Kawasaki, et al.
Stroboscopic time-of-flight neutron
diffraction during cyclic testing using theevent data recording system at J-PARC
J. Appl. Crystallog., Vol. 51, 630-634
A-051
P. G. Xu, et al.
High stereographic resolution texture andresidual stress evaluation using time‐of‐flight neutron diffraction
J. Appl. Crystallogr., Vol. 51, 746-760
A-052
A. Shinozaki, et al.
Behavior of intermolecular interactions ina-glycine under high pressure
J. Chem. Phys., Vol. 148, 044507
A-053
F. Nemoto, et al.
Neutron scattering studies on short- andlong-range layer structures and related
dynamics in imidazolium-based ionic liquids
J. Chem. Phys., Vol. 149, 054502/1-11
A-054
K. Yoshida, et al.
Thermal behavior, structure, dynamic
properties of aqueous glycine solutions
confined in mesoporous silica MCM-41
investigated by x-ray diffraction and quasielastic neutron scattering
J. Chem. Phys., Vol. 149, 124502
A-055
S. Takada, et al.
Characterization of germanium detectors forthe measurement of the angular distributionof prompt γ-rays at the ANNRI in the MLF of
the J-PARC
J. Instrum., Vol. 13, P02018
A-056
V. Bayliss, et al.
The liquid-hydrogen absorber for MICE
J. Instrum., Vol. 13, T09008
A-057
A. Suzuki, et al.
The LiteBIRD Satellite Mission: Sub-KelvinPublications

J-PARC Annual Report 201876
Instrument
J. Low Temp. Phyis., Vol. 193, 1048
A-058
T. Hasebe, et al.
Concept Study of Optical Configurations forHigh-Frequency Telescope for LiteBIRD
J. Low Temp. Phys., Vol. 193, 841
A-059
K. Fujii, et al.
High oxide-ion conductivity by theoverbonded channel oxygens in Si-deficientLa9.565(Si5.826□0.174)O26 apatite without
interstitial oxygens
J. Mater. Chem. A, Vol. 6, 10835-10846
A-060
Y. Iwasaki, et al.
Synthesis, crystal structure, and ionic
conductivity of hydride ion-conducting
Ln2LiHO3 (Ln = La, Pr, Nd) oxyhydrides
J. Mater. Chem. A, Vol. 6, 23457-23463
A-061
H. Abe, et al.
Dynamic properties of nano-confined waterin an ionic liquid
J. Mol. Liq., Vol. 264, 54-57
A-062
H. Muta, et al.
Effect of hydrogenation conditions on the
microstructure and mechanical properties ofzirconium hydride
J. Nucl. Mater., Vol. 500, 145-152
A-063
A. Mori, et al.
Manufacturing and characterization of Nifree N-containing ODS austenitic alloy
J. Nucl. Mater., Vol. 501, 72-81
A-064
T. Wakui, et al.
Recent studies for structural integrity
evaluation and defect inspection of J-PARC
spallation neutron source target vessel
J. Nucl. Mater., Vol. 506, 3-11
A-065
Y. Iwamoto, et al.
Measurement of displacement cross sectionsof aluminum and copper at 5 K by using 200
MeV protons
J. Nucl. Mater., Vol. 508, 195
A-066
H. Katagiri, et al.
Development of an all-sky gamma-ray
Compton camera based on scintillators forhigh-dose environments
J. Nucl. Sci. and Technol., Vol. 55, 1172
A-067
K. Terada, et al.
Measurements of neutron total and capture

cross sections of 241Am with ANNRI at
J-PARCJ. Nucl. Sci. and Technol., Vol. 55, 1198-1211
A-068
H. Takei, et al.
Evaluation of mean time between accidental
interruptions for accelerator klystronsystems based on the reliability engineeringand method
J. Nucl. Sci. and Technol., Vol. 55, 996-1008
A-069
H. Iwamoto, et al.
Monte Carlo uncertainty quantification of
the effective delayed neutron fraction
J. Nucl. Sci. Technol., Vol. 55, 539-547

A-077
T. Tsuchiya, et al.
Mn2VAl Heusler alloy thin films: Appearanceof antiferromagnetism and exchange bias ina layered structure with Fe
J. Phys. D: Appl. Phys., Vol. 51, 065001
A-078
K. Iwasa, et al.
Magnetic-Ordering Propagation Vectors of
Terbium Hexaboride Revisited
J. Phys. Soc. Jpn., Vol. 87, 64705
A-079
T. Nakajima, et al.
Uniaxial-stress effects on helimagnetic
orders and skyrmion lattice in Cu2OSeO3
J. Phys. Soc. Jpn., Vol. 87, 094709

A-070
H. Matsuda, S. Meigo, H. Iwamoto
Proton-induced activation cross section
measurement for aluminum with protonenergy range from 0.4 to 3 GeV at J-PARC
J. Nucl. Sci. Technol., Vol. 55, 955-961

A-080
T. Matsushita, et al.
Principle and Reconstruction Algorithm for
Atomic-Resolution Holography
J. Phys. Soc. Jpn., Vol. 87, 061002

A-071
M. Hirai, et al.
Restoration of myoglobin native fold fromits initial state of amyloid formation bytrehalose
J. Phys. Chem. B, Vol. 122, 11962-11968

A-081
H. Kadowaki, et al.
Continuum excitation and pseudospin wave
in quantum spin-liquid and quadrupoleordered states of Tb2+xTi2-xO7+yJ. Phys. Soc. Jpn., Vol. 87, 064704

A-072
Y. Kameda, et al.
Neutron Diffraction Study on the Structureof Hydrated Li(+) in Dilute Aqueous
SolutionsJ. Phys. Chem. B, Vol. 122, 1695-1701

A-082
N. Metoki, et al.
Neutron Inelastic Scattering Study of the
f-Electron States in NdPd5Al2
J. Phys. Soc. Jpn., Vol. 87, 084708

A-073
S. Ajito, et al.
Sugar-mediated stabilization of protein
against chemical or thermal denaturation
J. Phys. Chem. B, Vol. 122, 8685-8697
A-074
J. Kijima, et al.
Structural characterization of myoglobin
molecules adsorbed within mesoporous
silicasJ. Phys. Chem. C, Vol. 122, 15567-15574
A-075
S. Taminato, et al.
Reversible Structural Changes and HighRate Capability of Li3PO4-Modified Li2RuO3for Lithium-Rich Layered Rocksalt Oxide
CathodesJ. Phys. Chem. C, Vol. 122, 16607
A-076
F. Tamura, et al.
Baseband simulation model of the vector rf
voltage control system for the J-PARC RCS
J. Phys. Conf. Ser., Vol. 1067, 072030_1 072030_6

A-083
Y. Oba, et al.
Imaging Measurement of Neutron
Attenuation by Small-Angle Neutron
Scattering Using Soller Collimator
J. Phys. Soc. Jpn., Vol. 87, 094004
A-084
K. Oyama, et al.
Neutron Diffraction Studies on Valence
Ordering Compound YbPd
J. Phys. Soc. Jpn., Vol. 87, 114705
A-085
Y. Idemoto, et al.
Effect of operating temperature on
local structure during first discharge of
0.4Li2MnO3-0.6LiMn1/3Ni1/3Co1/3O2
electrodes
J. POWER SOURCES, Vol. 378, 198-208
A-086
K. Ninomiya, et al.
Muonic X-ray measurements on mixtures of
CaO/MgO and Fe3O4/MnO
J. Radioanal. Nucl. Chem., Vol. 316, 1107-1111
A-087
N.V. Mdlovu, et al.

J-PARC Annual Report 2018

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77
Multifunctional nanocarrier as apotential micro-RNA delivery vehicle forneuroblastoma treatment
J. Taiwan Inst. Chem. Eng., Vol. 96, 526-537
A-088
W. Uno, et al.
Experimental visualization of oxide-ion
diffusion paths in pyrochlore-type Yb2Ti2O7
JCS-Japan, Vol. 126, 341-345
A-089
K. Fujii, et al.
Discovery and development of BaNdInO4 - A
brief review JCS-Japan, Vol. 126, 852-859
A-090
Y. Kitanaka, et al.
Crystal Structure and ferroelectric
polarization of tetragonal (Bi1/2Na1/2)
TiO3–12 %BaTiO3
Jpn. J. Appl. Phys., Vol. 57, 11UD05
A-091
Y. Ogata, et al.
Impact of the Solid Interface on Proton
Conductivity in Nafion Thin Films
Langmuir, Vol. 34, 15483-15489
A-092
K. Shimokita, et al.
Effect of Preferential Orientation of
Lamellae in Interfacial Region between
Block Copolymer-based Pressure-Sensitive
Adhesive and Solid Substrate on the PeelStrength
Langmuir, Vol. 34, 2856-2864
A-093
K. Yanagi, et al.
Polyrotaxane brushes dynamically formed ata water/elastomer interface
Langmuir, Vol. 34, 5297-5302
A-094
F. Endo, et al.
Mechanically tough syndiotactic
polypropylene (sPP) gels realized by fast
quenching using liquid nitrogen
Macromolecules, Vol. 51, 2321-2327
A-095
Y. Shudo, et al.
Diffusion Behavior of Methanol Molecules
Confined in Cross-linked Phenolic Resins
Studied using Neutron Scattering and
Molecular Dynamics Simulations
Macromolecules, Vol. 51, 6334-6343
A-096
T. Iwamoto, et al.
Conformations of ring polystyrenes insemidilute solutions and in linear polymer
matrices studied by SANS
Macromolecules, Vol. 51, 6836–6847

A-097
T. Sun, et al.
Investigation of residual stress distribution
and texture evolution in AA7050 stationary
shoulder friction stir welded joints
Mater. Sci. Eng. A,, Vol. 712, 531-538
A-098
K. Murasawa, et al.
Determination Approach of Dislocation
Density and Crystallite Size Using a
Convolutional Multiple Whole Profile
SoftwareMater. Trans., Vol. 59, 1135-1141
A-099
A. Taketani, et al.
Quantification of localized water image inunder-film corroded steel with high spatial
resolution, high time resolution, and wideview by neutron radiography
Mater. Trans., Vol. 59, 976-983
A-100
T. Wan, S. Saito
Flow-Accelerated Corrosion of Type
316L Stainless Steel Caused by Turbulent
Lead?Bismuth Eutectic Flow
Metals, Vol. 8, 627, pp. 1-22 https://doi.
org/10.3390/met8080627
A-101
B. Li, et al.
Liquid-like thermal conduction inintercalated layered crystalline solidsNat. Mater., Vol. 17, 226-230
A-102
W. Yao, et al.
Topological spin excitations in a three
dimensional antiferromagnet
Nat. Phys., Vol. 14, 1011-1015
A-103
T. Matsumura, et al.
A neutral-beam profile monitor with aphosphor screen and a high-sensitivity
camera for the J-PARC KOTO experiment
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
885, 91
A-104
K. Satou, et al.
New data acquisition system for beam loss
monitor used in J-PARC main ring
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
887, 174
A-105
R. Maruyama, et al.
Development of high-polarization Fe/Ge
neutron polarizing supermirror: Possibilityof fine-tuning of scattering length density inion beam sputtering
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
888, 70-78

A-106
M. Abe, et al.
Magnetic design and method of asuperconducting magnet for muon g - 2/
EDM precise measurements in a cylindricalvolume with homogeneous magnetic field
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
890, 51
A-107
B. Kim, et al.
Development of a microchannel plate based
beam profile monitor for a re-accelerated
muon beam
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
899, 22-27
A-108
H. Ito, et al.
Performance check of the CsI(Tl) calorimeterfor the J-PARC E36 experiment by observinge+ from muon decay
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
901, 1
A-109
Y. Morita, et al.
Capacitor bank of power supply for J-PARC
MR main magnets
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
901, 156
A-110
M. Tomizawa, et al.
Slow extraction from the J-PARC main ringusing a dynamic bump
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
902, 51
A-111
M. Harada, et al.
Experimental validation of the brightness
distribution on the surfaces of coupledand decoupled moderators composed of
99.8% parahydrogen at the J-PARC pulsed
spallation neutron source
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
903, 38-45
A-112
S. Itoh, et al.
Pendellosung interferometry by using
pulsed neutrons
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
908, 78
A-113
W. Guan, et al.
Optimization study on structural analyses for
the J-PARC mercury target vessel
Nucl. Instrum. Methods Phys. Res. Sect. A, Vol.
894, 8-19
A-114
T. Fujiwara, et al.
Radiation imaging with glass gas electron
multipliers (G-GEMs)

Publications

J-PARC Annual Report 201878
Nucl. Instrum. Methods Phys. Res., Sect. A, Vol.
878, 40-49
A-115
M.Teshigawara, et al.
Implementation of a low-activation Au-InCd decoupler into the J-PARC 1 MW shortpulsed spallation neutron source
Nuclear Materials and Energy, Vol. 14, 14-21
A-116
T. Takamuku, et al.
Hydrogen bonds of the imidazolium-ringof ionic liquids with DMSO studied by NMR,
soft X-ray spectroscopy, and SANS
Phys. Chem. Chem. Phys., Vol. 20, 12858
A-117
Y. Ishii, et al.
Pressure-induced stacking disorder inboehmitePhys. Chem. Chem. Phys., Vol. 20, 16650
A-118
A. Doté, et al.
Fully coupled-channel study of K–pp
resonance in a chiral SU(3)-based -K N
potential
Phys. Lett. B, Vol. 784, 405
A-119
P. K. Saha, et al.
Simulation, measurement, and mitigationof beam instability caused by the kicker
impedance in the 3-GeV rapid cycling
synchrotron at the Japan Proton Accelerator
Research Complex
Phys. Rev. Accel. Beams, 21(2), 024203_1 024203_20

A-124
S. Shamoto, et al.
Neutron scattering study of yttrium irongarnetPhys. Rev. B, Vol. 97, 054429
A-125
K. Horigane, et al.
Magnetic phase diagram of Sr2–xLaxIrO4
synthesized by mechanical alloying
Phys. Rev. B, Vol. 97, 064425
A-126
T. Hattori
Is there a pressure-induced discontinuousvolume change in liquid Cs?
Phys. Rev. B, Vol. 97, 100101®
A-127
I. Yamauchi, et al.
Local spin structure of the α-RuCl3
honeycomb-lattice magnet observed via
muon spin rotation/relaxation
Phys. Rev. B, Vol. 97, 134410
A-128
S. Hayashida, et al.
Pressure-induced quantum phase transitionin the quantum antiferromagnet CsFeCl3
Phys. Rev. B, Vol. 97, 140405®
A-129
T. Kim, et al.
Renormalization of spin excitations inhexagonal HoMnO3 by magnon-phonon
coupling
Phys. Rev. B, Vol. 97, 201113®

A-120
S. Bae, et al.
First muon acceleration using a radiofrequency accelerator
Phys. Rev. Accel. Beams, Vol. 21, 050101

A-130
N. Murai, et al.
Effect of electron correlations on spin
excitation bandwidth in Ba0.75K0.25Fe2As2
as seen via time-of-flight inelastic neutron
scattering
Phys. Rev. B, Vol. 97, 241112®

A-121
Y. Shobuda, et al.
Reducing the beam impedance of the kicker
at the 3-GeV rapid cycling synchrotron of theJapan Proton Accelerator Research Complex
Phys. Rev. Accel. Beams, Vol. 21, 061003

A-131
T. Nakajima, et al.
Phase-transition kinetics of magnetic
skyrmions investidated by stroboscopic
small-angle neutron scattering
Phys. Rev. B, Vol. 98, 014424

A-122
A. W. T. Gregg, et al.
Tomographic Reconstruction of TwoDimensional Residual Strain Fields from
Bragg-Edge Neutron Imaging
Phys. Rev. Appl., Vol. 10, 064034

A-132
H. Okabe, et al.
Local electronic structure of interstitialhydrogen in iron disulfide
Phys. Rev. B, Vol. 98, 075210

A-123
H. Shishido, et al.
High-Speed Neutron Imaging Using a
Current-Biased Delay-Line Detector ofKinetic InductancePhys. Rev. Appl., Vol. 18, 044044

A-133
P. Wu, et al.
Investigation of the electronic structure
and lattice dynamics of the thermoelectricmaterial Na-doped SnSe
Phys. Rev. B, Vol. 98, 094305

A-134
S. Lee, et al.
Magnetoelastic octahedral breathing modein the ferrimagnetic La2CoIrO6 double
perovskite
Phys. Rev. B, Vol. 98, 104409
A-135
S. Torigoe, et al.
Nanoscale ice-type structural fluctuation inspinel titanates
Phys. Rev. B, Vol. 98, 134443
A-136
H. Tamatsukuri, et al.
Gapless magnetic excitation in a heavily
electron-doped antiferromagnetic phase of
LaFeAsO0.5D0.5
Phys. Rev. B, Vol. 98, 174415
A-137
T. Moyoshi, et al.
Inelastic neutron scattering study on theelectronic transition in (Pr1-yYy)1-xCaxCoO3
single crystals
Phys. Rev. B, Vol. 98, 205105
A-138
H. Kohri, et al.
Differential cross section and photon-beamasymmetry for the → γp ! π+n reaction at
forward π+ angles at Eγ = 1.5–2.95 GeV
Phys. Rev. C, Vol. 97, 015205
A-139
S. H. Shiu, et al.
Photoproduction of Λ and Σ0 hyperons off
protons with linearly polarized photons at Eγ= 1.5–3.0 GeV
Phys. Rev. C, Vol. 97, 015208
A-140
M. Aaboud, et al.
Measurement of long-range multiparticle
azimuthal correlations with the subevent
cumulant method in pp and p+Pb collisions
with the ATLAS detector at the CERN Large
Hadron Collider
Phys. Rev. C, Vol. 97, 024904
A-141
T. Okudaira, et al.
Angular distribution of γ rays from neutroninduced compound states of 140La
Phys. Rev. C, Vol. 97, 034622
A-142
A. Konishi, et al.
Degenerate two-body and three-bodycoupled-channels systems: Renormalized
effective Alt-Grassberger-Sandhas equations
and near-threshold resonances
Phys. Rev. C, Vol. 97, 064001
A-143
A. Adare, et al.
Measurements of mass-dependentJ-PARC Annual Report 2018

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79
azimuthal anisotropy in central p + Au, d +Au, and 3He + Au collisions at √sNN =200
GeV
Phys. Rev. C, Vol. 97, 064904
A-144
A. Adare, et al.
Lévy-stable two-pion Bose-Einsteincorrelations in √sNN =200 GeV Au+Au
collisions
Phys. Rev. C, Vol. 97, 064911
A-145
A. Adare, et al.
Measurement of emission-angle anisotropy
via long-range angular correlations withhigh-pT hadrons in d + Au and p + p
collisions at√sNN = 200 GeV
Phys. Rev. C, Vol. 98, 014912
A-146
A. Adare, et al.
Low-momentum direct-photon
measurement in Cu + Cu collisions at√sNN= 200 GeV
Phys. Rev. C, Vol. 98, 054902
A-147
C. Aidala, et al.
Production of π0 and η mesons in Cu + Au
collisions at √sNN = 200 GeV
Phys. Rev. C, Vol. 98, 054903
A-148
K. Abe, et al.
First measurement of the νμ charged-current
cross section on a water target without pions
in the final statePhys. Rev. D, Vol. 97, 012001
A-149
S. Kumano, et al.
Hadron tomography by generalized
distribution amplitudes in the pion-pair
production process γ * γ ! π0π0 andgravitational form factors for pion
Phys. Rev. D, Vol. 97, 014020
A-150
K. Abe, et al.
Measurement of the single π0 production
rate in neutral current neutrino interactions
on waterPhys. Rev. D, Vol. 97, 032002

Phys. Rev. D, Vol. 97, 072001
A-153
A. Aguilar-Arevalo, et al.
Improved search for heavy neutrinos in the
decay π → eνPhys. Rev. D, Vol. 97, 072012
A-154
K. Abe, et al.
Measurement of inclusive doubledifferential νμ charged-current cross section
with improved acceptance in the T2K off-axis
near detector
Phys. Rev. D, Vol. 98, 012004
A-155
C. Aidala, et al.
Single-spin asymmetry of J/ψ production
in p + p, p + Al, and p + Au collisions withtransversely polarized proton beams
at√sNN = 200 GeV
Phys. Rev. D, Vol. 98, 012006
A-156
K. Abe, et al.
Characterization of nuclear effects in muonneutrino scattering on hydrocarbon with ameasurement of final-state kinematics andcorrelations in charged-current pionlessinteractions at T2K
Phys. Rev. D, Vol. 98, 032003
A-157
A. Adare, et al.
Cross section and longitudinal single-spin
asymmetry AL for forward W ± ! μ ± √ ν
production in polarized p + p collisions at s
= 510 GeV
Phys. Rev. D, Vol. 98, 032007
A-158
Z. Li, et al.
Measurement of the tau neutrino crosssection in atmospheric neutrino oscillations
with Super-Kamiokande
Phys. Rev. D, Vol. 98, 052006
A-159
C. Aidala, et al.
Nonperturbative transverse-momentumdependent effects in dihadron and direct
photon-hadron angular correlations in p + p
collisions at√s = 200 GeV
Phys. Rev. D, Vol. 98, 072004

A-151
C. C. Haddock, et al.
A Search for deviations from the inverse
square law of gravity at nm range using apulsed neutron beam
Phys. Rev. D, Vol. 97, 062002

A-160
M. Aghasyan, et al.
Light isovector resonances in π-p →π-π-π+p
at 190 GeV/c
Phys. Rev. D, Vol. 98, 092003

A-152
K. Abe, et al.
Atmospheric neutrino oscillation analysis
with external constraints in SuperKamiokande I-IV

A-161
A. Adare, et al.
Measurement of φ-meson production at
forward rapidity in p + p collisions at √ s =510 GeV and its energy dependence from √s = 200 GeV to 7 TeV
Phys. Rev. D, Vol. 98, 092006
A-162
R. Inoue, et al.
Experimental investigation of the glasstransition of polystyrene thin films in a broadfrequency range
Phys. Rev. E, Vol. 97, 012501
A-163
C. Aidala, et al.
Nuclear Dependence of the TransverseSingle-Spin Asymmetry for Forward Neutron
Production in Polarized p + A Collisions
at√sNN = 200 GeV
Phys. Rev. Lett., Vol. 120, 022001
A-164
C. Aidala, et al.
Measurements of Multiparticle Correlationsin d +Au Collisions at 200, 62.4, 39, and 19.6
GeV and p +Au Collisions at 200 GeV and
Implications for Collective Behavior
Phys. Rev. Lett., Vol. 120, 062302
A-165
S. B. Yang, et al.
First Determination of the Level Structure ofan sd-Shell Hypernucleus, 19 F
Phys. Rev. Lett., Vol. 120, 132505
A-166
T. Xie, et al.
Neutron Spin Resonance in the 112-Type
Iron-Based Superconductor
Phys. Rev. Lett., Vol. 120, 137001
A-167
H. Kohri, et al.
Differential Cross Section and Photon-Beam
Asymmetry for the → γp ! π – Δ++(1232)
Reaction at Forward π – Angles for Eγ=1.5–
2.95 GeV
Phys. Rev. Lett., Vol. 120, 202004
A-168
C. Kachulis, et al.
Search for Boosted Dark Matter Interactingwith Electrons in Super-Kamiokande
Phys. Rev. Lett., Vol. 120, 221301
A-169
T. Xie, et al.
Odd and Even Modes of Neutron Spin
Resonance in the Bilayer Iron-Based
Superconductor CaKFe4As4
Phys. Rev. Lett., Vol. 120, 267003
A-170
K. Kurashima, et al.
Development of Ferromagnetic Fluctuations
in Heavily Overdoped (Bi,Pb)2Sr2CuO6+δ
Copper Oxides
Phys. Rev. Lett., Vol. 121, 057002

Publications

J-PARC Annual Report 2018

80
A-171
J. Sugiyama, et al.
Nuclear magnetic field in solids detectedwith negative-muon spin rotation andrelaxation
Phys. Rev. Lett., Vol. 121, 087202

A-181
S. Itoh, et al.
Magnetic excitations in metallic
antiferromagnets Fe0.5Mn0.5 andFe0.7Mn0.3
Physica B, Vol. 551, 21-23

A-172
K. Abe, et al.
Search for CP Violation in Neutrino andAntineutrino Oscillations by the T2K
Experiment with 2.2 1021 Protons on Target
Phys. Rev. Lett., Vol. 121, 171802

A-182
N. L. Yamada, et al.
In-situ measurement of phospholipid
nanodisk adhesion on a solid substrate using
neutron reflectometry and atomic force
microscopy
Physica B, Vol. 551, 222-226

A-173
A. Adare, et al.
Pseudorapidity Dependence of Particle
Production and Elliptic Flow in Asymmetric
Nuclear Collisions of p + Al, p + Au, d + Au,
and 3He + Au at√sNN = 200 GeV
Phys. Rev. Lett., Vol. 121, 222301
A-174
Y. Sakaguchi, et al.
Kinetics of Silver Photodiffusion Into
Amorphous Ge 20 S 80 Films: Case of PreReaction
Phys. Status Solidi A, Vol. 215, 1800049
A-175
K. Ohoyama, et al.
White Neutron Holography in Pulsed
Neutron Facilities
Phys. Status Solidi B, Vol. 225, 1800143
A-176
D. Ueta, et al.
Crystalline electric field level scheme of the
non-centrosymmetric CePtSi3
Physica B, Vol. 536, 21-23
A-177
M. Yoshida, et al.
Magnetic and thermodynamic studies on
the charge and spin ordering in the highly
hole-doped La2-xSrxCoO4
Physica B, Vol. 536, 338-341
A-178
K. Matsuura, et al.
Magnetic excitations in the orbital
disordered phase of MnV2O4
Physica B, Vol. 536, 372-376
A-179
K. Ikeuchi, et al.
Detailed study of the structure of the lowenergy magnetic excitations in overdoped
La1.75Sr0.25CuO4
Physica B, Vol. 536, 717-719
A-180
K. Nakajima, et al.
High-energy magnetic excitations in lightly
oxygen-doped lanthanum nickel oxides
Physica B, Vol. 551, 142-145

A-183
Y. Kawakita, et al.
Anomaly of structural relaxation incomplex liquid metal of bismuth - Dynamic
correlation function of coherent quasi-elastic
neutron scattering Physica B, Vol. 551, 291-296
A-184
M. Nakamura, et al.
Phonon dynamics of NaI investigated by G(r,E) analysis
Physica B, Vol. 551, 351-354
A-185
K. Iwasa, et al.
Inelastic neutron scattering study on 4 f-electron multipole system PrTr2X20 (Tr :transition metal, X : Al and Zn)
Physica B, Vol. 551, 37-40
A-186
M. Nakamura, et al.
Performances of oscillating radial collimator
for the Fermi chopper spectrometer
4SEASONS at J-PARC
Physica B, Vol. 551, 480-483
A-187
H. Ninomiya, et al.
Neutron diffraction study of
antiferromagnetic ErNi3Ga9 in magnetic
fieldsPhysica B: Cond. Matter, Vol. 536, 392-396
A-188
Z. Tan, et al.
The investigation of magnetic phasetransition in cobaltite perovskites byhighresolution neutron powder diffraction under
14 T magnetic fieldPhysica B: Cond. Matter, Vol. 551, 111-114
A-189
K. Hiroi, et al.
Study of the magnetization distribution in agrain-oriented magnetic steel using pulsed
polarized neutron imaging
Physica B: Cond. Matter, Vol. 551, 146-151
A-190
M. Hirai, et al.

Macromolecular crowding effect on protein
structure and hydration clarified by using
X-ray and neutron scattering
Physica B: Cond. Matter, Vol. 551, 212-217
A-191
S. Ajito, et al.
Protective action of trehalose and glucose
on protein hydration shell clarified by using
X-ray and neutron scattering
Physica B: Cond. Matter, Vol. 551, 249-255
A-192
K. Akutsu, et al.
Penetration behavior of an ionic liquidin thin-layer silica coating: Ionic liquid
deuteration and neutron reflectivity analysis
Physica B: Cond. Matter, Vol. 551, 262-265
A-193
M. Mizusawa, et al.
An electrochemical cell with verticalgeometry for neutron reflectivity
measurements
Physica B: Cond. Matter, Vol. 551, 270-273
A-194
J. Abe, et al.
Effect of gauge volume on strain
measurement in rock materials using timeof-flight neutron diffraction
Physica B: Cond. Matter, Vol. 551, 283-286
A-195
W. R. Puspita, et al.
Temperature Dependence of Structural
Disorder in Thermoelectric Clathrate
Ba8Al16Ge30
Physica B: Cond. Matter, Vol. 551, 41-45
A-196
K. Sakurai, et al.
Hadamard coding of time-of-flight neutronreflectogram at grazing incidence
Physica B: Cond. Matter, Vol. 551, 426-430
A-197
K. Oikawa, et al.
Recent progress on practical materials study
by Bragg edge imaging at J-PARC
Physica B: Cond. Matter, Vol. 551, 436-442
A-198
N. Miyata, et al.
Relatively thick (few micrometers) film
structure estimated by back-incidence
neutron reflectometry
Physica B: Cond. Matter, Vol. 551, 449-451
A-199
Y. Ishikawa, et al.
Z-MEM, Maximum Entropy Method softwarefor electron/nuclear densitydistribution in
Z-CodePhysica B: Cond. Matter, Vol. 551, 472-475

J-PARC Annual Report 2018

Publications

81
A-200
T. Kai, et al.
Characteristics of the 2012 model lithium-6
time-analyzer neutron detector (LiTA12)
system as a high efficiency detector forresonance absorption imaging
Physica B: Cond. Matter, Vol. 551, 496-500
A-201
H. Iwase, et al.
Installation of a high-resolution positionsensitive scintillation detector in thesmall and wide angle neutron scattering
instrument (TAIKAN), MLF, J-PARC
Physica B: Cond. Matter, Vol. 551, 501-505
A-202
Y. Seki, et al.
Effect of upstream beam collimation on
neutron phase imaging with a Talbot-Lau
interferometer at the RADEN beam line in
J-PARC
Physica B: Cond. Matter, Vol. 551, 512-516
A-203
P. Wu, et al.
Crystal structure of high-performance
thermoelectric materials by high resolution
neutron powder diffraction
Physica B: Cond. Matter, Vol. 551, 64-68
A-204
S. Lee, et al.
Weak-ferromagnetism of CoF3 and FeF3
Physica B: Cond. Matter, Vol. 551, 94-97
A-205
H. Kumada, et al.
Development of LINAC-Based Neutron
Source for Boron Neutron Capture Therapy
in University of Tsukuba
Plasma Fusion Res., 13(0), 2406006-2406006
A-206
H. Takei, et al.
Beam Extraction by the Laser Charge
Exchange Method Using the 3-MeV LINAC
in J-PARC
Plasma Fusion Res., Vol. 13, 2406012
A-207
F. Maekawa, Transmutation Experiment
Facility design Team

J-PARC transmutation experimental facility
program
Plasma Fusion Res., Vol. 13, 2505045
A-208
K. Abe, et al.
Physics potentials with the second HyperKamiokande detector in Korea
Prog. Theor. Exp. Phys., 2018, 063C01
A-209
N. Kawamura, et al.
New concept for a large-acceptance generalpurpose muon beamline
Prog. Theor. Exp. Phys., 2018, 113G01
A-210
Y. Shobuda
Evaluation of the frequency dependenceof the complex conductivity of a resistive
chamber by comparing theoretical andmeasured S-matrices
Prog. Theor. Exp. Phys., Vol. 2018, Issue 12,
123G01
A-211
Y. Ashida, et al.
A new electron-multiplier-tube-based beam
monitor for muon monitoring at the T2K
experiment
PTEP, 2018, 103H01
A-212
M. Ishikado, et al.
High-energy spin fluctuation in low-Tc ironbased superconductor LaFePO0.9
Sci. Rep., Nol. 8, 16343
A-213
A. Sano-Furukawa, et al.
Direct observation of symmetrization ofhydrogen bond in δ-AlOOH under mantle
conditions using neutron diffraction
Sci. Rep., Vol. 8, 15520
A-214
M. Sales, et al.
Three Dimensional Polarimetric Neutron
Tomography of Magnetic Fields
Sci. Rep., Vol. 8, 2214
A-215
V. Ukleev, et al.

Unveiling structural, chemical and magnetic
interfacial peculiarities in ε-Fe2O3/GaN(0001) epitaxial films
Sci. Rep., Vol. 8, 8741
A-216
R. Kajimoto, et al.
Elastic and dynamical structural propertiesof La and Mn-doped SrTiO3 studied byneutron scattering and their relation withthermal conductivities
Sci. Rep., Vol. 8, 9651
A-217
K. Kataoka, et al.
Lithium-ion conducting oxide single crystal
as solid electrolyte for advanced lithium
battery application
Sci. Rep., Vol. 8, 9965
A-218
Y. Shobuda, et al
Rigorous formulation of space-charge wake
function and impedance by solving thethree-dimensional Poisson equation
Sci. Rep., Vol. 8, Article number: 12805
A-219
B. Wang, et al.
Deformation of CoCrFeNi high entropy alloyat large strain
Scr. Mater., Vol. 155, 54-57
A-220
J. J. Kang, et al.
Directed Vertical Diffusion of Photovoltaic
Active Layer Components into Porous ZnObased Cathode Buffer Layers
Small, Vol. 14, 04310
A-221
H. Tanoue, et al.
Thermoresponsive Dynamic Polymer
Brush Fabricated by the Segregation ofAmphiphilic Diblock Copolymers
Soft Matter, Vol. 14, 5930-5935
A-222
N. Ishida, et al.
Average and local structure analysis ofmetastable LixMn0.9Ti0.1O2 by synchrotron
X-ray and neutron sources
Solid State Ion., Vol. 325, 209-213

Conference Reports and Books
B-001
T. Nakamura, et al.
A sub-millimeter spatial resolution
scintillation neutron detector for time-offlight neutron diffraction imaging
2018 IEEE NSS and MIC, conference record,
N07-197

B-002
T. Okuda, et al.
Schottky specific heat of the lightly Mnsubstituted electron-doped SrTiO3
AIP Advances, Vol. 8, 101339
B-003
K. Shinto, et al.

Present status of the J-PARC cesiated RFdriven H– ion source
AIP Conf. Proc. Vol. 2011, 050018-1 - 050018-3
B-004
T. Yokoo, et al.
Ready to Roll? Time to Launch POLANOAIP Conf. Proc., Vol. 1969, 050001

Publications

J-PARC Annual Report 2018

82
B-005
S. Itoh, et al.
High Resolution Chopper Spectrometer HRC
and Neutron Brillouin Scattering
AIP Conf. Proc., Vol. 1969, 050002
B-006
R. Kajimoto, et al.
Instrumental Resolution of the Chopper
Spectrometer 4SEASONS Evaluated byMonte Carlo Simulation
AIP Conf. Proc., Vol. 1969, 050004
B-007
T. Shibata, et al.
Observation of plasma density oscillation
with doubled value of RF frequency in
J-PARC RF ion source
AIP Conf. Proc., Vol. 2011, 020008-1 - 020008-3
B-008
K. Shinto, et al.
Observation of beam current fluctuation
extracted from an RF-driven H- ion source
AIP Conf. Proc., Vol. 2011, 080016-1 - 080016-3
B-009
K. Shinto, et al.
Progress of the J-PARC cesiated rf-driven
negative hydrogen ion source
AIP Conf. Proc., Vol. 2052 00002-1 - 050002-7
B-010
A. Ueno, et al.
Solving Beam Intensity Bottlenecks and 100
mA Operation of J-PARC Cesiated RF-Driven
H– Ion Source
AIP Conf. Proc., Vol. 2052, 050003
B-011
K.Yamamoto, et al.
Activation in injection area of J-PARC
3-GeV rapid cycling synchrotron and its
countermeasures
ANS RPSD 2018
B-012
S. Kumano, et al.
Tomography and gravitational radii for
hadrons by three-dimensional structure
functions
EPJ Web Conf., Vol. 181, 01025
B-013
J. Kamiya
Vacuum technologies in the high-power
proton beam accelerator:J-PARC
Hydraulics & pneumatics, 2018.7., 44
B-014
T. Takayanagi, et al.
Development of a new modular switch using
a next-generation semiconductor
IOP Conf. Ser.: J. Phys.: Conf. Ser., Vol. 1067 ,
082019B-015
K. Ikeuchi, et al.
Fe-impurity-induced magnetic
excitations in heavily over-doped
La1.7Sr0.3Cu0.95Fe0.05O4
IOP Conf. Ser.: J. Phys.: Conf. Ser., Vol. 969,
012024
B-016
K. Mochiki, et al.
Pulsed-neutron imaging by a high-speed
camera and center-of-gravity processing
J. Instrum., Vol. 13, C01038
B-017
M. Tomizawa, et al.
Beam Optics Design of Stretcher Ring andTransfer Line for J-PARC Slow Extraction
J. Phys. Conf. Ser. Vol. 1067, 042004
B-018
K. Satou, et al.
A novel field cage design for the CPS IPM
and systematic errors in beam size andemittance
J. Phys. Conf. Ser., Vol. 1067, 072008
B-019
D. Kawana, et al.
YUI and HANA: Control and Visualization
Programs for HRC in J-PARC
J. Phys. Conf. Ser., Vol. 1021, 012014

Conceptual design of a single-ended MA
cavity for J-PARC RCS upgrade
J. Phys. Conf. Ser., Vol. 1067, 052014
B-026
M. Otani, et al.
Simulation of Surface Muon Beamline,
UltraSlow Muon Production and Extraction
for the J-PARC g-2/EDM Experiment
J. Phys. Conf. Ser., Vol. 1067, 052018
B-027
T. Shibata, et al.
The Development of a New Low Field
Septum Magnet System for Fast Extraction in
Main Ring of J-PARC
J. Phys. Conf. Ser., Vol. 1067, 052020
B-028
Y. Shobuda, et al.
Reduction of the Kicker Impedance
Maintaining the Performance of Present
Kicker Magnet at RCS in J-PARC
J. Phys. Conf. Ser., Vol. 1067, 062007
B-029
B. Yee-Rendon, et al.
Updated model of the resistive wall
impedance for the main ring of J-PARC
J. Phys. Conf. Ser., Vol. 1067, 062009

B-020
S. Meigo, et al.
Target test facility for ADS and cross-section
experiment in J-PARC
J. Phys. Conf. Ser., Vol. 1021, 012072

B-030
P. K. Saha, et al.
ORBIT Simulation, Measurement and
Mitigation of Transverse Beam Instability in
the Presence of Strong Space Charge in the
3-GeV RCS of J-PARC
J. Phys. Conf. Ser., Vol. 1067, 062013

B-021
M. Tomizawa, et al.
Beam Optics Design of Stretcher Ring andTransfer Line for J-PARC Slow Extraction
J. Phys. Conf. Ser., Vol. 1067, 042004

B-031
A. Miura, et al.
Tensile fracture test of metalic wire of beamprofile monitors
J. Phys. Conf. Ser., Vol. 1067, 072007

B-022
J. Tamura, et al.
Low-Reflection RF Window for ACS Cavity in
J-PARC Linac
J. Phys. Conf. Ser., Vol. 1067, 052009

B-032
K. Moriya, et al.
Study of a tuner for a high-accuracy bunchshape monitor
J. Phys. Conf. Ser., Vol. 1067, 072009

B-023
M. Otani, et al.
Muon Profile Measurement After
Acceleration With a Radio-Frequency
Quadrupole linac
J. Phys. Conf. Ser., Vol. 1067, 052012

B-033
F. Tamura, et al.
Baseband simulation model of the vector rf
voltage control system for the J-PARC RCS
J. Phys. Conf. Ser., Vol. 1067, 072030

B-024
M. Otani, et al.
Muon Profile Measurement After
Acceleration With a Radio-Frequency
Quadrupole linac
J. Phys. Conf. Ser., Vol. 1067, 052012
B-025
M. Yamamoto, et al.

B-034
M. Otani, et al.
Longitudinal Bunch Size Measurements withan RF Deflector at J-PARC LINAC
J. Phys. Conf. Ser., Vol. 1067, no. 6, 052008
B-035
A. Miura, et al.
Application of carbon nanotube wire forbeam profile measurement of negative

J-PARC Annual Report 2018

Publications

83
hydrogen ion beam
J. Phys. Conf. Ser., Vol. 1067, no. 6, 072020
B-036
H. Takahashi, et al.
Improvement of motor control system in
J-PARC linac and RCS
J. Phys. Conf. Ser., Vol. 1067, no. 6, 072022
B-037
H. Hotchi, et al.
Pulse-by-pulse switching of operationalparameters in J-PARC 3-GeV RCS
J. Phys. Conf. Ser., Vol. 1067, no.6, 062013
B-038
T. Tanaka, et al.
High precision measurement of muonium
hyperfine structure
J. Phys. Conf. Ser., Vol. 1138, 012008
B-039
C. Trippl, et al.
A New Silicon Drift Detector System for
Kaonic Atom Measurements
J. Phys. Conf. Ser., Vol. 1138, 012013
B-040
K. Nakajima, et al.
Recent issues encountered by AMATERAS: A
cold-neutron disk-chopper spectrometer
J. Phys.: Conf. Ser., Vol. 1021, 012031
B-041
Y. Inamura, et al.
Applications of the differential events
reading method at MLF, J-PARC
J. Phys.: Conf. Ser., Vol. 1021, 012015
B-042
H. Matsuda, et al.
Measurement of activation cross sectionsof the target and the proton beam windowmaterials at J-PARC
J. Phys.: Conf. Ser., Vol. 1021, 012016
B-043
H. Matsuda, et al.
The measurements of neutron energy
spectrum at 180 degrees with the mercury
target at JJ. Phys.: Conf. Ser., Vol. 1021, 012017
B-044
H. Matsuda, S. Meigo, H. Iwamoto
The measurements of neutron energy
spectrum at 180 degrees with the mercury
target at J-PARC
J. Phys.: Conf. Ser., Vol. 1021, 012017
B-045
S. Itoh, et al.
Improvement for Neutron Brillouin
Scattering Experiments on High Resolution
Chopper Spectrometer HRC
J. Phys.: Conf. Ser., Vol. 1021, 012028

B-046
R. Kajimoto, et al.
Status report of the chopper spectrometer
4SEASONS
J. Phys.: Conf. Ser., Vol. 1021, 012030
B-047
T. Kai, et al.
Off-gas processing system operations for
mercury target vessel replacement at J-PARC
J. Phys.: Conf. Ser., Vol. 1021, 012042
B-048
H. Iwamoto, H. Matsuda, S. Meigo
Shielding analysis of Transmutation
Experimental Facility
J. Phys.: Conf. Ser., Vol. 1021, 012049
B-049
M. Teshigawara, et al.
Present fabrication status of sparemoderators and reflector in J-PARC
spallation neutron source
J. Phys.: Conf. Ser., Vol. 1021, 012061
B-050
T. Aso, et al.
Recovery of helium refrigerator performancefor cryogenic hydrogen system at J-PARC
MLF
J. Phys.: Conf. Ser., Vol. 1021, 012085
B-051
Y. Miki, et al.
Neutron signal features of Nb-based kinetic
inductance detector with 10B convertor
J. Phys.: Conf. Ser., Vol. 1054, 012054
B-052
T. Koyama, et al.
Electrodynamic theory for the operation
principle of a superconducting kinetic
inductance stripline detector
J. Phys.: Conf. Ser., Vol. 1054, 012055
B-053
Y. Iizawa, et al.
Physical characteristics of delay-line currentbiased kinetic inductance detector
J. Phys.: Conf. Ser., Vol. 1054, 012056
B-054
J. Kamiya, et al.
Non-destructive 2-D beam profile monitor
using gas sheet in J-PARC LINAC
J. Phys.: Conf. Ser.,072006
B-055
S. Ohira-Kawamura, et al.
Magnetic Properties of One-Dimensional
Quantum Spin System Rb2Cu2Mo3O12
Studied by Muon Spin Relaxation
JPS Conf. Proc., Vol. 21, 011007
B-056
M. Fujita, et al.
μSR Study of Magnetism in the As-

Prepared and Non-Superconducting T*La0.9Eu0.9Sr0.2CuO4
JPS Conf. Proc., Vol. 21, 011026
B-057
T. Sumura, et al.
Reduction Effects on the Cu-Spin Correlationin the Electron-Doped T'-Cuprate Pr1.3xLa0.7CexCuO4+δ (x = 0.10)
JPS Conf. Proc., Vol. 21, 011027
B-058
K. Nishimura, et al.
Muon Spin Relaxation of an Al–3.4%Zn–
1.9%Mg alloy
JPS Conf. Proc., Vol. 21, 011030
B-059
M. Mihara, et al.
μSR Study on Hydrogen Behavior in
Palladium
JPS Conf. Proc., Vol. 21, 011031
B-060
T. Kiyotani, et al.
Visualization of proton and electron transfer
processes of a biochemical reaction by μSR
JPS Conf. Proc., Vol. 21, 011037
B-061
A. D. Pant, et al.
Theoretical Calculations of Charge Statesand Stopping Sites of Muons in Glycine andTriglycine
JPS Conf. Proc., Vol. 21, 011038
B-062
G. Liu, et al.
Supercritical Water Experimental Setup forμSR
JPS Conf. Proc., Vol. 21, 011039
B-063
I. Umegaki, et al.
Detection of Li in Li-ion Battery Electrode
Materials by Muonic X-ray
JPS Conf. Proc., Vol. 21, 011041
B-064
K. Ninomiya, et al.
Isotope Identification of Lead by
Muon Induced X-ray and Gamma-ray
Measurements
JPS Conf. Proc., Vol. 21, 011043
B-065
G. Yabu, et al.
Imaging of Muonic X-ray of Light Elementswith a CdTe Double-Sided Strip Detector
JPS Conf. Proc., Vol. 21, 011044
B-066
G. Yoshida, et al.
Development of Muonic Atom Beam
Extraction System and First Evaluation by
Intense Negative Muon Beam of J-PARC
MUSE

Publications

J-PARC Annual Report 201884
JPS Conf. Proc., Vol. 21, 011046
B-067
P. Strasser, et al.
Possibility of New Precise Measurements of
Muonic Helium Atom HFS at J-PARC MUSEJPS Conf. Proc., Vol. 21, 011046
B-068
Y. Miyake, et al.
J-PARC muon facility, MUSEJPS Conf. Proc., Vol. 21, 011054
B-069
D. Tomono, et al.
Muon Beamline Commissioning andFeasibility Study for μSR at a New DC Muon
Beamline, MuSIC-RCNP, Osaka University
JPS Conf. Proc., Vol. 21, 011057
B-070
S. Makimura, et al.
Perspective of Muon Production Target at
J-PARC MLF MUSEJPS Conf. Proc., Vol. 21, 011058
B-071
S. Matoba, et al.
Renovation of a Scraper Unit of a Muon
Production Target at J-PARC
JPS Conf. Proc., Vol. 21, 011059
B-072
A. D. Pant, et al.
Transportation of Ultra Slow Muon on U-line,
MLF, J-PARC
JPS Conf. Proc., Vol. 21, 011060
B-073
P. Strasser, et al.
Status of the New Surface Muon Beamline at
J-PARC MUSEJPS Conf. Proc., Vol. 21, 011061
B-074
K. M. Kojima, et al.
Development of General Purpose μSR
Spectrometer ARTEMIS at S1 Experimental
Area, MLF J-PARC
JPS Conf. Proc., Vol. 21, 011062
B-075
R. Katayama, et al.
Development of new neutron mirrors formeasuring the neutron electric dipole
momentJPS Conf. Proc., Vol. 22, 011009
B-076
R. Maruyama, et al.
Effect of the interfacial roughness correlationon the reflectivity in a neutron multilayer
mirrorJPS Conf. Proc., Vol. 22, 011011
B-077
J. D. Parker, et al.

Development of Energy-Resolved Neutron
Imaging Detectors at RADENJPS Conf. Proc., Vol. 22, 011022
B-078
T. Uragaki, et al.
Evaluation of high-frame-rate camera withdigital accumulation system combined withneutron color image intensifier for energy
resolved neutron imaging
JPS Conf. Proc., Vol. 22, 011027
B-079
M. Segawa, et al.
Spatial Resolution Test Targets Made ofGadolinium and Gold for Conventional andResonance Neutron Imaging
JPS Conf. Proc., Vol. 22, 011028
B-080
K. Hiroi, et al.
Development of a Polarization Analysis
Method for Visualization of the Magnetic
Field Distribution in a Small ElectricTransformer using Pulsed Polarized Neutron
Imaging
JPS Conf. Proc., Vol. 22, 011030

neutronics of the ADS
Proc. of AccApp2017 396-402 (2018).
B-087
S. Saito, et al.
Design of LBE spallation target for ADS
target test facility (TEF-T) in J-PARC
Proc. of AccApp2017, 448-457 (2018)
B-088
K. Moriyama, et al.
Development of status analysis system
based on ELK stack at J-PARC MLF
Proc. of ICALEPCS
B-089
F.A. Mavuso, et al.
Iron oxide-pluronic F127 polymer
nanocomposites as carriers for doxorubicin
drug delivery system
Proc. of ICRAMS
B-090
F.A. Mavuso, et al.
Synthesis and structural characterizationof polymer-magnetic nanocomposites as
carriers for drug delivery system
Proc. of ICRAMS

B-081
T. Kumada, et al.
Development of Dynamic Nuclear
Polarization System for Spin-ContrastVariation Neutron Reflectometry
JPS Conf. Proc., Vol. 22, 11015

B-091
K.Yamamoto, et al.
Recent status of J-PARC rapid cycling
synchrotron
Proc. of IPAC2018

B-082
T. Koyama, et al.
Deformation Analysis of Reinforced Concrete
using Neutron Imaging Technique
Materials Research Proc., Vol. 4, 155-160

B-092
K. Hasegawa, et al.
Performance and status of the J-PARC
accelerators
Proc. of IPAC2018 (Internet), 1038-1040

B-083
M. Kumagai, et al.
Convergence Behavior in Line Profile
Analysis Using Convolutional Multiple
Whole-Profile Software
Materials Research Proc., Vol. 6, 57-62

B-093
Y. Kondo, et al.
Re-acceleration of Ultra Cold Muon in J-PARC
Muon Facility
Proc. of IPAC2018 (Internet), 5041-5046

B-084
Y. Sato, et al.
Critical Conditions of Cold Cracking inHigh Strength Steel Weld Based on the
Local Stress Distribution and Hydrogen
Accumulation
Materials Scientific Forum, Vol. 941, 153-157
B-085
S. Satoh
Development of a Flat-Panel and ResistorType Photomultiplier Tube System forHigh Position-Resolution Two-Dimensional
Neutron Detector
PFR, Vol. 13, 2405056
B-086
S. Meigo, H. Iwamoto, H. Matsuda
Cross section measurement in J-PARC for

B-094
T. Takayanagi, et al.
New design and development for an
ultrahigh-voltage short pulse switch power
supplyProc. of EAPPC
B-095
S. V. Cao
Latest results from T2K
Proc. of EW2018, 259
B-096
S. Meigo
Beam instruments for high power spallation
neutron source and facility for ADS
Proc. of HB2018, pp., 99-103
B-097
P. Saha, et al.

J-PARC Annual Report 2018

Publications

85
Status of proof-of principle demonstrationof 400 MeV H- stripping to proton by using
only lasers at J-PARC
Proc. of HB2018 (Internet), 422-427
B-098
H. Hotchi
J-PARC RCS: Effects of emittance exchange
on injection painting
Proc. of HB2018, 20-25
B-099
Y. Iwamoto, et al.
Radiation damage calculation in PHITS andbenchmarking experiment for cryogenicsample high-energy proton irradiation
Proc. of HB2018, 116-121
B-100
S. Igarashi
HIGH-POWER BEAM OPERATION AT J-PARC
Proc. of HB2018, 147
B-101
M. Tomizawa, et al.
STATUS AND BEAM POWER RAMP-UP PLANS
OF THE SLOW EXTRACTION OPERATION AT
J-PARC MAIN RING
Proc. of HB2018, 347
B-102
Y. Liu, et al.
60 mA BEAM STUDY IN J-PARC LINAC
Proc. of HB2018, 60
B-103
P.K. Saha, et al.
MEASUREMENT OF EACH 324 MHz MICROPULSE STRIPPING EFFICIENCY FOR H– LASERSTRIPPING EXPERIMENT IN J-PARC RCS
Proc. of IBIC2017 (Internet), 233-236(2017)
B-104
S. I. Meigo, et al.
Profile monitor on target for spallation
neutron source
Proc. of IBIC2017, pp., 373-376 (2018)
B-105
H. Takei, et al.
Beam extraction by the laser charge
exchange method using the 3-MeV linac in
J-PARC
Proc. of IBIC2017, pp., 435-439 (2018)
B-106
N. Hayashi, et al.
ANALYSIS OF INTERLOCKED EVENTS BASEDON BEAM INSTRUMENTATION DATA AT
J-PARC LINAC AND RCS
Proc. of IBIC2018, 219-223
B-107
K. Nakayoshi, et al.
DEVELOPMENT OF AN EXPERT SYSTEMFOR THE HIGH INTENSITY NEUTRINO BEAM
FACILITY AT J-PARC

Proc. of IBIC2018, 154
B-108
K. Sakashita, et al.
UPGRADE OF THE MACHINE PROTECTIONSYSTEM TOWARD 1.3MW OPERATION OF THE
J-PARC NEUTRINO BEAMLINE
Proc. of IBIC2018, 18
B-109
S. Cao, et al.
OPTICAL SYSTEM OF BEAM INDUCEDFLUORESCENCE MONITOR TOWARD MW
BEAM POWER AT THE J-PARC NEUTRINOBEAMLINE
Proc. of IBIC2018, 505
B-110
M. Friend
BEAM PARAMETER MEASUREMENTS FOR
THE J-PARC HIGH-INTENSITY NEUTRINOEXTRACTION BEAMLINE
Proc. of IBIC2018, 85
B-111
Y. Nakamura, et al.
In Situ Neutron Diffraction Study on
Microstructure Evolution During ThermoMechanical Processing of Medium
Manganese SteelProc. of ICOMAT, 155-158
B-112
N. Tsuchida, et al.
TRIP Effect in a Constant Load Creep Test at
Room Temperature
Proc. of ICOMAT, 43-46
B-113
S. Meigo, et al.
MEASUREMENT OF DISPLACEMENT CROSSSECTION FOR STRUCTURAL MATERIALSIN HIGH-POWER PROTON ACCELERATORFACILITY
Proc. of IPAC2018, pp., 499-501
B-114
K. Yamamoto, et al.
Recent status of J-PARC rapid cycling
synchrotron
Proc. of IPAC2018
B-115
K. Hasegawa, et al.
Performance and status of the J-PARC
accelerators
Proc. of IPAC2018 (Internet), 1038-1040
B-116
Y. Kondo, et al.
Re-acceleration of Ultra Cold Muon in J-PARC
Muon Facility
Proc. of IPAC2018 (Internet), 5041-5046
B-117
R. Kitamura, et al.
RESULT OF THE FIRST MUON ACCELERATIONWITH RADIO FREQUENCY QUADRUPOLE
Proc. of IPAC2018, 1190
B-118
H. Iinuma, et al.
THREE-DIMENSIONAL SPIRAL BEAMINJECTION FOR A COMPACT STORAGE RING
Proc. of IPAC2018, 1673
B-119
S. Li, et al.
ADAPTIVE FEEDFORWARD CONTROL DESIGNBASED ON SIMULINK FOR J-PARC LINAC LLRF
SYSTEM
Proc. of IPAC2018, 2187
B-120
N. Ogiwara, et al.
A NON-DESTRUCTIVE 2D PROFILE MONITOR
USING A GAS SHEET
Proc. of IPAC2018, 2190
B-121
T. Toyama, et al.
MEASUREMENT OF TRANSVERSE DIPOLEAND QUADRUPOLE MOMENTS WITH THE
BPMS IN THE J-PARC 3-50 BT
Proc. of IPAC2018, 2197
B-122
K. Futatsukawa, et al.
IMPROVEMENT OF THE CHOPPER SYSTEMFOR RF DEFLECTOR AT THE J-PARC LINAC
Proc. of IPAC2018, 2816
B-123
Y. Sato
HIGH POWER BEAM OPERATION OF THE
J-PARC RCS AND MR
Proc. of IPAC2018, 2938
B-124
A. Miura, et al.
APPLICATION OF CARBON NANOTUBE WIRE
FOR BEAM PROFILE MEASUREMENT OFNEGATIVE HYDROGEN ION BEAM
Proc. of IPAC2018, 5022
B-125
T. Koseki
UPGRADE PLAN OF J-PARC MR - TOWARD 1.3
MW BEAM POWER
Proc. of IPAC2018, 966
B-126
M. Otani, et al.
SIMULATION OF SURFACE MUON BEAM
LINE, ULTRASLOW MUON PRODUCTION
AND EXTRACTION FOR THE J-PARC G-2/EDM
EXPERIMENT
Proc. of IPAC2018, 970
B-127
M. Otani, et al.
LONGITUDINAL BUNCH SIZE
MEASUREMENTS WITH AN RF DEFLECTOR AT
J-PARC LINAC

Publications

J-PARC Annual Report 201886
Proc. of IPAC2018, 974
B-128
M. Yoshii, et al.
PRESENT STATUS AND FUTURE UPGRADES
OF THE J-PARC RING RF SYSTEMS
Proc. of IPAC2018, 984
B-129
K. Futatsukawa, et al.
DEVELOPMENT OF NEW LLRF SYSTEM AT THE
J-PARC LINAC
Proc. of LINAC2018, 233
B-130
R. Kitamura, et al.
MUON ACCELERATION TEST WITH THE RFQ
TOWARDS THE DEVELOPMENT OF THE
MUON LINAC
Proc. of LINAC2018, 342
B-131
J. Y. Yoon, et al.
DESIGN STUDY OF A PROTOTYPE 325MHz RF
POWER COUPLER FOR SUPERCONDUCTINGCAVITY
Proc. of LINAC2018, 451
B-132
T. Shibata, et al.
NUMERICAL AND EXPERIMENTAL STUDY OF
H- BEAM DYNAMICS IN J-PARC LEBT
Proc. of LINAC2018, 519
B-133
N. Oi, et al.
A Search for Possible Deviations from
Newtonian Gravity at the nm Length Scale
Using Neutron-Noble Gas Scattering
Proc. of NOP2017
B-134
S. Tada, et al.
Development of High Spatial Resolution
Cold/Ultra-Cold Neutron Detector Using
Nano Imaging Tracker
Proc. of NOP2017
B-135
K. Mishima, et al.
Fundamental physics activities with pulsed
neutron at J-PARC(BL05)
Proc. of NOP2017
B-136
N. Sumi, et al.
Precise Neutron Lifetime Measurement witha Solenoidal Coil
Proc. of NOP2017
B-137
S. Imajo, et al.
Time-focus Experiment of Ultracold Neutron
by Improved UCN Rebuncher at J-PARC/MLF
Proc. of NOP2017

B-138
Wan, T., Obayashi, H., Sasa, T.
Optimization of design of the LBE spallation
target at JAEA
Proc. of NUTHOS-12 (USB flash memory), 14
pages
B-139
T. Kimura
DEVELOPMENT OF THE NEW SPILL CONTROLDEVICE for J-PARC MR
Proc. of PCaPAC2018, 192
B-140
N. Kamikubota, et al.
DEVELOPMENT OF TRIGGERED SCALER TO
DETECT MISS-TRIGGER
Proc. of PCaPAC2018, 213
B-141
S. Kumano
Theoretical perspective for the future
experiments on parton densities
Proc. of Science, DIS 2018, 245
B-142
T. Kumada, et al.
Development of closed-cycle dynamic
nuclear polarization system for smallangle neutron scattering and neutronreflectometry
Proc. of Science, Vol. 324, 9
B-143
T. Takayanagi, et al.
Development of solid-state switch for power
supply with SiC-MOSFET
Proc. of 15th Annual Meeting of PASJ (Internet)
B-144
A. Tokuchi, et al.
Research on accelerator applications of 13
kV high voltage SiC devices
Proc. of 15th Annual Meeting of PASJ (Internet),
1010-1014
B-145
H. Yasuda, et al.
DEVELOPMENT OF MUON SPIN ROTATORFOR J-PARC MUON g - 2/EDM EXPERIMENT
Proc. of 15th Annual Meeting of PASJ (Internet),
1027-1030
B-146
T. Miyao, et al.
BEAM PROFILE MEASUREMENT USINGCARBON NANOTUBE WIRES (3)Proc. of 15th Annual Meeting of PASJ (Internet),
1031-1034
B-147
Y. Nakazawa, et al.
Commissioning of the diagnostic beam line
for the muon RF acceleration with negativehydrogen ion beam derived from theultraviolet light
Proc. of 15th Annual Meeting of PASJ (Internet),

1047-1050
B-148
Y. Sue, et al.
Development of the good time resolution
monitor to measure the longitudinal
structure of low-rate muon bunch for J-PARC
E34 ExperimentProc. of 15th Annual Meeting of PASJ (Internet),
1051-1054
B-149
N. Hayashi, et al.
MONITORING OF THE INJECTED BEAM TO
THE J-PARC RCS AND BPM DESIGN FOR H0
DUMP LINE
Proc. of 15th Annual Meeting of PASJ (Internet),
1055-1059
B-150
F. Tamura, et al.
NEXT GENERATION LLRF CONTROL SYSTEMFOR J-PARC RCS
Proc. of 15th Annual Meeting of PASJ (Internet),
1131-1135
B-151
K. Hasegawa, et al.
STATUS OF J-PARC ACCELERATORS
Proc. of 15th Annual Meeting of PASJ (Internet),
1317-1321
B-152
M. Sato, et al.
Status report of the iBNCT accelerator
Proc. of 15th Annual Meeting of PASJ (Internet),
1350-1354
B-153
M. Otani, et al.
BEAM COMMISSIONING OF J-PARC MEBT1FOR A HIGHER BEAM CURRENT
Proc. of 15th Annual Meeting of PASJ (Internet),
216-219
B-154
R. Kitamura, et al.
Demonstration of the muon RF acceleration
with the negative muonium
Proc. of 15th Annual Meeting of PASJ (Internet),
239-243
B-155
K. Suganuma, et al.
Present status of water cooling system at
J-PARC LINAC 2018
Proc. of 15th Annual Meeting of PASJ (Internet),
309-311
B-156
K. Hirano, et al.
STATUS OF 3MeV BEAM SCRAPERS FOR THE
J-PARC LINAC
Proc. of 15th Annual Meeting of PASJ (Internet),
324-328

J-PARC Annual Report 2018

Publications

87
B-157
T. Shibata, et al.
Status of development on LaB6 filamentmulti-cusp ion source for iBNCT
Proc. of 15th Annual Meeting of PASJ (Internet),
385-387

B-166
K. Akutsu, et al.
Development of new waterproof thin-layers
for the magnetic alloy core and structural
study by neutron reflectometry
Proc. of the 15th Annual Meeting of PASJ, 1198

B-158
Y. Kondo, et al.
Low power test of an L-band RFQ
Proc. of 15th Annual Meeting of PASJ (Internet),
421-424

B-167
H. Hotchi, et al.
J-PARC RCS: Effects of nonlinear fieldcomponents of injection bump magnets on
circulating beamProc. of the 15th Annual Meeting of PASJ, 371375

B-159
S. Lim, et al.
An improvement of compact pulsed power
supply for Ion source using 13kV-SiCMOSFET
Proc. of 15th Annual Meeting of PASJ (Internet),
488-489
B-160
T. Watanabe, et al.
Development of beam energy position
monitor system for RIKEN superconducting
acceleration cavity
Proc. of 15th Annual Meeting of PASJ (Internet),
49-54
B-161
J. Kamiya, et al.
Upgrade of vacuum chamber at RCS beam
injection area aimed at lower radiation andmaintainability increase
Proc. of 15th Annual Meeting of PASJ (Internet),
645-648
B-162
P. K. Saha, et al.
PROGRESS STATUS OF PROOF-OF-PRINCIPLE
DEMONSTRATION OF 400 MeV H- LASERSTRIPPING AT J-PARC 3-GeV RCS
Proc. of 15th Annual Meeting of PASJ (Internet),
806-810
B-163
K. Ohkoshi, et al.
Operation Status of the J-PARC H- Ion Source
Proc. of 15th Annual Meeting of PASJ (Internet),
889-892
B-164
Y. Nakazawa, et al.
Performance test of Inter-digital H-mode
drift-tube linac prototype with alternative
phase focusing for muon linac
Proc. of 15th Annual Meeting of PASJ (Internet),
904-908
B-165
H. Takahashi, et al.
Standardization of Stepping Motor Control
System in J-PARC Linac and RCS
Proc. of the 15th Annual Meeting of PASJ,1105-1108

B-168
Y. H. Chin, et al.
Chromaticity effects on head-tail instabilities
for broadband impedance using two particle
model, Vlasov analysis, and simulations
Proc. of the 15th Annual Meeting of PASJ,
THP030B-169
E. Yanaoka, et al.
The Improvement of forced synchronous trip
system of bump magnet power supplies
Proc. of the 15th Annual Meeting of PASJ,
WEP078B-170
K. Miura, et al.
MAGNET POWER SUPPLY CALIBRATION WITH
A PORTABLE CURRENT MEASURING UNIT AT
THE J-PARC MAIN RING
Proc. of the 15th Annual Meeting of PASJ, 1015
B-171
H. Yasuda, et al.
DEVELOPMENT OF MUON SPIN ROTATORFOR J-PARC MUON g - 2/EDM EXPERIMENT
Proc. of the 15th Annual Meeting of PASJ, 1027
B-172
T. Miyao, et al.
BEAM PROFILE MEASUREMENT USINGCARBON NANOTUBE WIRES (3) - BEAM
PROFILES IN HIGH ENERGY PART IN LINAC Proc. of the 15th Annual Meeting of PASJ, 1031
B-173
M. Okada, et al.
DUALIZE OF INTRA-BUNCH FEEDBACK
SYSTEM IN J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 1044
B-174
Y. Nakazawa, et al.
COMMISSIONING OF THE DIAGNOSTIC BEAM
LINE FOR THE MUON RF ACCELERATIONWITH H- ION BEAM DERIVED FROM THEULTRAVIOLET LIGHT
Proc. of the 15th Annual Meeting of PASJ, 1047
B-175
Y. Sue, et al.
J-PARC E34 EXPERIMENT: DEVELOPMENT OF

THE GOOD TIME RESOLUTION MONITOR TO
MEASURE THE LONGITUDINAL STRUCTURE
OF LOW-RATE MUON BUNCH
Proc. of the 15th Annual Meeting of PASJ, 1051
B-176
K. Agari, et al.
TEMPERATURE MEASUREMENT OF BEAM
DUMP AT J-PARC HADRON EXPERIMENTAL
FACILITY
Proc. of the 15th Annual Meeting of PASJ, 1065
B-177
T. Sugimoto, et al.
MEASURES AGAINST BEAM LOSS DUE TORESIDUAL MAGNETIZATION OF FERRITEFOR FAST EXTRACTION KICKER MAGNET OF
J-PARC MAIN RING
Proc. of the 15th Annual Meeting of PASJ, 1082
B-178
Y. Tajima, et al.
DEVELOPMENT OF EPICS-BASED SOFTWARE
OF TRIGGERED SCALER
Proc. of the 15th Annual Meeting of PASJ, 1091
B-179
K. Sato, et al.
DEMONSTRATIVE APPLICATIONS OFTRIGGERED SCALER IN J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 1095
B-180
T. Soma, et al.
APPLYING OF SYSTEM INVARIANTANALYSIS TECHNOLOGY (SIAT) TO J-PARC
ACCELERATOR SYSTEM
Proc. of the 15th Annual Meeting of PASJ, 114
B-181
Y. Kawabata, et al.
EXPERIMENTAL APPLICATION OF
POSITIONING SENSOR NETWORK SYSTEMAND DISASTER PREVENTION APP IN J-PARC
Proc. of the 15th Annual Meeting of PASJ, 119
B-182
M. Uota, et al.
AFTER 10 YEARS, IS THERE ANY AGING
DETERIORATION OF VACUUM SYSTEM AT
J-PARC MR?
Proc. of the 15th Annual Meeting of PASJ, 1190
B-183
M. Otani, et al.
BEAM COMMISSIONING OF J-PARC MEBT1FOR A HIGHER BEAM CURRENT
Proc. of the 15th Annual Meeting of PASJ, 216
B-184
Y. Sugiyama, et al.
THE FEEDBACK SYSTEM FOR THE
LONGITUDINAL COUPLED BUNCHOSCILLATION IN J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 220

Publications

J-PARC Annual Report 2018

88
B-185
Y. Kurimoto, et al.
EVALUATION OF SLOW-EXTRACTED BEAMQUALITY WITH REAL-TIME BETATRON TUNE
CORRECTION USING MAGNET CURRENT AT
J-PARC MAIN RING
Proc. of the 15th Annual Meeting of PASJ, 225
B-186
Y. Fukao, et al.
MEASUREMENT OF PROTON BEAM PROFILE
AT 8 GEV ACCELERATION COMMISSIONING
FOR THE J-PARC COMET EXPERIMENT
Proc. of the 15th Annual Meeting of PASJ, 231
B-187
M. Tomizawa, et al.
8GeV-SLOW EXTRACTION TEST FOR
MUON ELECTRON CONVERSION SEARCH
EXPERIMENT
Proc. of the 15th Annual Meeting of PASJ, 235
B-188
R. Kitamura, et al.
DEMONSTRATION OF THE MUON RF
ACCELERATION WITH THE NEGATIVEMUONIUM
Proc. of the 15th Annual Meeting of PASJ, 239
B-189
M. Shirakata, et al.
RADIATION MONITORING IN THE
DOWNSTREAM AREA OF J-PARC MR
COLLIMATORS
Proc. of the 15th Annual Meeting of PASJ, 267
B-190
R. Muto, et al.
BEAM COMMISSIONING OF SLOWEXTRACTION AT J-PARC MAIN RING
Proc. of the 15th Annual Meeting of PASJ, 305
B-191
K. Hara, et al.
STATUS REPORT OF DEVELOPMENT OFSECOND HARMONIC RF SYSTEM IN J-PARC
MR
Proc. of the 15th Annual Meeting of PASJ, 312
B-192
Y. Morita, et al.
FUSE ARCING TEST FOR CAPACITOR BANK OF
MAIN MAGNET POWER SUPPLY IN J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 319
B-193
Y. Arakaki, et al.
AN IMPROVEMENT AND HIGH VOLGAGE
TEST OF TITANIUM-ESS IN J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 329
B-194
T. Yasui, et al.
MEASUREMENTS OF TUNE SHIFTS BY THE
SPACE CHARGE EFFECT IN J-PARC MR
Proc. of the 15th Annual Meeting of PASJ,338

B-195
H. Watanabe, et al.
DESIGN OF BEAM WINDOW MADE OF
BERYLLIUM AT J-PARC HADRON FACILITY
Proc. of the 15th Annual Meeting of PASJ, 388

B-205
N. Kamikubota, et al.
DEVELOPMENT OF SLOW-SAMPLING
DIGITIZER FOR J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 587

B-196
H. Watanabe, et al.
DESIGN OF BEAM WINDOW MADE OF
BERYLLIUM AT J-PARC HADRON FACILITY
Proc. of the 15th Annual Meeting of PASJ, 388

B-206
A. Kobayashi, et al.
BUNCH TRAIN TUNE SHIFT STUDY FORHIGHER BEAM POWER AT J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 60

B-197
M. Furusawa, et al.
THE SPEEDUP FOR THE MACHINEPROTECTION SYSTEM ON THE RF
ACCELERATING SYSTEM IN J-PARC MAIN
RING
Proc. of the 15th Annual Meeting of PASJ, 480

B-207
A. Toyoda, et al.
DEVELOPMENT OF DATA ARCHIVE SYSTEMFOR J-PARC HADRON BEAMLINE(3)Proc. of the 15th Annual Meeting of PASJ, 601

B-198
D. Naito, et al.
PERFORMANCE ESTIMATION OF A NEW
POWER SUPPLY WITH HIGH REPETITION RATEOPERATION IN J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 494
B-199
K. Okamura, et al.
DEVELOPMENT A PULSED POWER SUPPLYUTILISING 13 KV CLASS SIC-MOSFETS
Proc. of the 15th Annual Meeting of PASJ, 504
B-200
T. Shimogawa, et al.
DEVELOPMENT OF CHARGING CONTROLFOR FLOATING CAPACITOR METHOD
Proc. of the 15th Annual Meeting of PASJ, 508
B-201
T. Toyama, et al.
BEAM SIZE MEASUREMENT WITH THE BPMS
IN THE J-PARC 3-50BT (2)Proc. of the 15th Annual Meeting of PASJ, 537
B-202
S. Meigo, et al.
MEASUREMENT OF DISPLACEMENT CROSSSECTION OF PROTON FOR 0.4 - 3 GEV
Proc. of the 15th Annual Meeting of PASJ, 549
B-203
K. Okamura, et al.
A CONSIDERATION ON THE TRANSFERFUNCTION BETWEEN RQ FIELD AND SLOWEXTRACTION SPILL IN THE MAIN RING OF
J-PARC
Proc. of the 15th Annual Meeting of PASJ, 558
B-204
K. Satou
GAMMA RAY IRRADIATION TEST OF
PROTOTYPE CUIRCUIT OF THE PHOT-ODIODE
BASED BEAM LOSS MONITOR FOR J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 569

B-208
T. Kimura, et al.
DEVELOPMENT OF A MS-ABORT SYSTEM VIA
J-PARC MR-MPS
Proc. of the 15th Annual Meeting of PASJ, 609
B-209
S. Yamada
REAL-TIME AND DETAILED PROVISION OF
ACCELERATOR OPERATION INFORMATIONFROM THE J-PARC ACCELERATOR CONTROLLAN TO THE J-PARC OFFICE LAN
Proc. of the 15th Annual Meeting of PASJ, 613
B-210
T. Michikawa, et al.
DEVELOPMENT OF WEB BASED ELECTRONICLOG AND PICTURE LOG SYSTEMS
Proc. of the 15th Annual Meeting of PASJ, 617
B-211
H. Iinuma, et al.
DEVELOPMENT OF THREE-DIMENSIONALSPIRAL BEAM INJECTION SCHEME WITH X-Y
COUPLING BEAM FOR MRI SIZED COMPACT
STORAGE RING CONFERENCES
Proc. of the 15th Annual Meeting of PASJ, 79
B-212
Y. Morita, et al.
DESIGN OF ACCELERATING CAVITY AND
INPUT COUPLER FOR LONGITUDINALEMITTANCE BLOW-UP IN J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 790
B-213
Y. Hashimoto, et al.
BEAM PROFILE MONITORS FOR SLOWEXTRACTED BEAM USING MULTI-LAYEREDGRAPHENE IN THE J-PARC
Proc. of the 15th Annual Meeting of PASJ, 794
B-214
S. Igarashi, et al.
STUDY ON THE BEAM INTENSITY UPGRADE
OF J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 799

J-PARC Annual Report 2018

Publications

89
B-215
H. Harada, et al.
DEVELOPMENT OF LASER SYSTEM FOR
A PROOF-OF-PRINCIPLE EXPERIMENT OF
LASER STRIPPING INJECTION
Proc. of the 15th Annual Meeting of PASJ, 811

B-221
T. Shimogawa, et al.
STATUS OF NEW POWER SUPPLY FOR
BENDING MAGNET IN J-PARC MAIN RINGUPGRADE
Proc. of the 15th Annual Meeting of PASJ, 992

B-216
H. Takahashi, et al.
DEVELOPMENT OF NEW PRODUCTIONTARGET AT J-PARC HADRON EXPERIMENTAL
FACILITY (2)Proc. of the 15th Annual Meeting of PASJ, 879

B-222
R. Kitamura, et al.
Muon acceleration test with the RFQ towards
the development of the muon linac
Proc. of the 29th LINAC2018 (Internet), 342-345

B-217
T. Morishita, et al.
RF DESIGN AND TUNING OF THE J-PARC RFQUSING THREE-DIMENSIONAL MODELING
Proc. of the 15th Annual Meeting of PASJ, 914
B-218
M. Sawamura, et al.
DEVELOPMENT OF HOM COUPLER WITH
C-SHAPED WAVEGUIDE
Proc. of the 15th Annual Meeting of PASJ, 934
B-219
Y. Yamamoto, et al.
RESEARCH ON CERAMIC AND COPPERPLATING FOR POWER COUPLERS
Proc. of the 15th Annual Meeting of PASJ, 938
B-220
K. Hasegawa, et al.
R&D STATUS OF 2ND HARMONIC RF CAVITIESWITH FT3M MA CORES AND A VACUUM
CAPACITOR FOR J-PARC MR
Proc. of the 15th Annual Meeting of PASJ, 943

B-223
M. Sato, et al.
Commissioning status of the linac for theiBNCT project
Proc. of the 29th LINAC2018(Internet), 174-176
B-224
Y. Nakazawa, et al.
Prototype of an Inter-digital H-mode drifttube linac for muon linac
Proc. of the 29th LINAC2018(Internet), 180-183
B-225
K. Futatsukawa, et al.
Development of new LLRF system at the
J-PARC linac
Proc. of the 29th LINAC2018(Internet), 233-235
B-226
H. Oguri
Approaches to high power operation of
J-PARC accelerator
Proc. of the 29th LINAC2018(Internet), 29-34

KEK Reports
C-001
T. Maruyama, et al.
12th KEK summer challenge in 2018
KEK Proc. 2018-8

JAEA Reports
D-001
H. Iwamoto, et al.
Assessment of Lead-bismuth-eutetic Leakat ADS Target Test Facility in Transmutation
Experimental Facility of J-PARC
JAEA-Technol. 2017-029 (2018)

D-002
Safety Division
Annual Report on the Activities of Safety in
J-PARC, FY2016
JAEA-Review 2017-033(2018)

B-227
T. Shibata, et al.
Numerical and experimental study of H–
beam dynamics in J-PARC LEBT
Proc. of the 29th LINAC2018(Internet), 519-521
B-228
K. Hasegawa
Operation experiences of the J-PARC linac
Proc. of the 29th LINAC2018(Internet), 774-777
B-229
Y. Kondo, et al.
Low power measurement of a 1300-MHz
RFQ cold model
Proc. of the 29th LINAC2018(Internet), 794-797
B-230
T. Morishita, et al.
Field tuning of a radio-frequency
quadrupole using full 3D modelingProc. of the 29th LINAC2018(Internet), 798-801
B-231
M. Yoshimoto, et al.
Measurement of Radio-activation and
Evaluation of Activated Nuclides due toSecondary Particles Produced in Stripper Foil
in J-PARC RCS
Proc. of The 29th World Conference of the
INTDS
B-232
M. Yoshimoto, et al.
Progress Status of Fabrication of Stripper
Foils for 3 GeV RCS of J-PARC in Tokai-site
Proc. of The 29th World Conference of the
INTDS

Publications

J-PARC Annual Report 201890

OthersE-001
K. Shibata
The Implementaton of the dynamics analysis
spetrometer DNA; The Pedigree of thebackscattering neutron spectrometer
neutron network news

E-004
H. Suzuki, et al.
Non-Destructive Bond Stress Evaluation of
Bending and Shear Deformed Reinforced
Concrete Structure using Neutron Diffraction
journal of N.D.I

E-002
A. DoteBook Reviews
Butsuri Vol. 73 No. 6, 401

E-005
M. Inagaki
Muon Transfer Rates from Muonic HydrogenAtoms to Gaseous Benzene and Cyclohexane
JNRS

D-003
M. Otani, et al.
RF Acceleration of Muon for the Realizationof Precise
Measurements of Muon g–2/EDM
Butsuri Vol. 73 No. 8, 564

E-006
M. Tomizawa
8 GeV Slow Extraction Beam Test for COMET
Experiment
Journal of PASJ, Vol. 15, No. 3, 117

E-007
M. Otani, et al.
Muon Acceleration Using a Linac
Journal of PASJ, Vol. 15, No. 2, 60
E-008
H. Harada, and K. Sakaue
Young Researchers Association of the Japan
Beam Physics Club
Journal of PASJ, Vol. 15, No. 3, 143
E-009
S. Sato, et al.
In-situ Observation of Dislocation Evolution
in Ferritic and Austenitic Stainless Steels
under Tensile Deformation by Using Neutron
Diffraction
Tetsu-to-Hagane

J-PARC Annual Report 2018
Vol.1: Highlight(C) J-PARC Center
January 2020

Japan proton accelerator research complex

High Energy Accelerator Research Organization (KEK)
Japan Atomic Energy Agency (JAEA)

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Pacific OceanTokyo

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Ueno
Tokyo

0

20

40km

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